diff --git a/core/lib/Drupal/Core/Entity/DatabaseStorageControllerNG.php b/core/lib/Drupal/Core/Entity/DatabaseStorageControllerNG.php
index e8998f8..4ccf8da 100644
--- a/core/lib/Drupal/Core/Entity/DatabaseStorageControllerNG.php
+++ b/core/lib/Drupal/Core/Entity/DatabaseStorageControllerNG.php
@@ -154,7 +154,7 @@ protected function attachLoad(&$queried_entities, $load_revision = FALSE) {
     // Map the loaded stdclass records into entity objects and according fields.
     $queried_entities = $this->mapFromStorageRecords($queried_entities, $load_revision);
 
-    // Attach fields.
+    // Activate backward-compatibility mode to attach fields.
     if ($this->entityInfo['fieldable']) {
       // Prepare BC compatible entities before passing them to the field API.
       $bc_entities = array();
@@ -270,6 +270,9 @@ protected function attachPropertyData(array &$entities, $load_revision = FALSE)
   public function save(EntityInterface $entity) {
     $transaction = db_transaction();
     try {
+      // Ensure we are dealing with the actual entity.
+      $entity = $entity->getOriginalEntity();
+
       // Load the stored entity, if any.
       if (!$entity->isNew() && !isset($entity->original)) {
         $entity->original = entity_load_unchanged($this->entityType, $entity->id());
@@ -279,7 +282,7 @@ public function save(EntityInterface $entity) {
       $this->invokeHook('presave', $entity);
 
       // Create the storage record to be saved.
-      $record = $this->maptoStorageRecord($entity);
+      $record = $this->mapToStorageRecord($entity);
 
       if (!$entity->isNew()) {
         if ($entity->isDefaultRevision()) {
@@ -446,7 +449,9 @@ protected function mapToStorageRecord(EntityInterface $entity) {
   protected function mapToRevisionStorageRecord(EntityInterface $entity) {
     $record = new \stdClass();
     foreach ($this->entityInfo['schema_fields_sql']['revision_table'] as $name) {
-      $record->$name = $entity->$name->value;
+      if (isset($entity->$name->value)) {
+        $record->$name = $entity->$name->value;
+      }
     }
     return $record;
   }
@@ -489,6 +494,11 @@ public function delete(array $entities) {
 
     $transaction = db_transaction();
     try {
+      // Ensure we are dealing with the actual entities.
+      foreach ($entities as $id => $entity) {
+        $entities[$id] = $entity->getOriginalEntity();
+      }
+
       $this->preDelete($entities);
       foreach ($entities as $id => $entity) {
         $this->invokeHook('predelete', $entity);
diff --git a/core/lib/Drupal/Core/Entity/EntityBCDecorator.php b/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
index 57215cb..7025fa1 100644
--- a/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
+++ b/core/lib/Drupal/Core/Entity/EntityBCDecorator.php
@@ -46,13 +46,23 @@ class EntityBCDecorator implements IteratorAggregate, EntityInterface {
   protected $decorated;
 
   /**
+   * Local cache for field definitions.
+   *
+   * @var array
+   */
+  protected $definitions;
+
+  /**
    * Constructs a Drupal\Core\Entity\EntityCompatibilityDecorator object.
    *
    * @param \Drupal\Core\Entity\EntityInterface $decorated
    *   The decorated entity.
+   * @param array
+   *   An array of field definitions.
    */
-  function __construct(EntityNG $decorated) {
+  function __construct(EntityNG $decorated, array &$definitions) {
     $this->decorated = $decorated;
+    $this->definitions = &$definitions;
   }
 
   /**
@@ -75,6 +85,11 @@ public function getBCEntity() {
    * Directly accesses the plain field values, as done in Drupal 7.
    */
   public function &__get($name) {
+    // Directly return the original property.
+    if ($name == 'original') {
+      return $this->decorated->values[$name];
+    }
+
     // We access the protected 'values' and 'fields' properties of the decorated
     // entity via the magic getter - which returns them by reference for us. We
     // do so, as providing references to these arrays would make $entity->values
@@ -88,7 +103,10 @@ public function &__get($name) {
       // the field objects managed by the entity, thus we need to ensure
       // $this->decorated->values reflects the latest values first.
       foreach ($this->decorated->fields[$name] as $langcode => $field) {
-        $this->decorated->values[$name][$langcode] = $field->getValue();
+        // Only set if it's not empty, otherwise there can be ghost values.
+        if (!$field->isEmpty()) {
+          $this->decorated->values[$name][$langcode] = $field->getValue();
+        }
       }
       // The returned values might be changed by reference, so we need to remove
       // the field object to avoid the field object and the value getting out of
@@ -96,21 +114,35 @@ public function &__get($name) {
       // receive the possibly updated value.
       unset($this->decorated->fields[$name]);
     }
-    // Allow accessing field values in entity default language other than
-    // LANGUAGE_DEFAULT by mapping the values to LANGUAGE_DEFAULT. This is
-    // necessary as EntityNG does key values in default language always with
-    // LANGUAGE_DEFAULT while field API expects them to be keyed by langcode.
-    $langcode = $this->decorated->language()->langcode;
-    if ($langcode != LANGUAGE_DEFAULT && isset($this->decorated->values[$name]) && is_array($this->decorated->values[$name])) {
-      if (isset($this->decorated->values[$name][LANGUAGE_DEFAULT]) && !isset($this->decorated->values[$name][$langcode])) {
-        $this->decorated->values[$name][$langcode] = &$this->decorated->values[$name][LANGUAGE_DEFAULT];
+    // When accessing values for entity properties that have been converted to
+    // an entity field, provide direct access to the plain value. This makes it
+    // possible to use the BC-decorator with properties; e.g., $node->title.
+    if (isset($this->definitions[$name]) && empty($this->definitions[$name]['configurable'])) {
+      if (!isset($this->decorated->values[$name][LANGUAGE_DEFAULT])) {
+        $this->decorated->values[$name][LANGUAGE_DEFAULT][0]['value'] = NULL;
+      }
+      $value = $this->decorated->values[$name][LANGUAGE_DEFAULT];
+      if (is_array($value)) {
+        $value = !empty($value[0]) ? reset($value[0]) : NULL;
       }
+      return $value;
     }
-
-    if (!isset($this->decorated->values[$name])) {
-      $this->decorated->values[$name] = NULL;
+    else {
+      // Allow accessing field values in entity default language other than
+      // LANGUAGE_DEFAULT by mapping the values to LANGUAGE_DEFAULT. This is
+      // necessary as EntityNG does key values in default language always with
+      // LANGUAGE_DEFAULT while field API expects them to be keyed by langcode.
+      $langcode = $this->decorated->language()->langcode;
+      if ($langcode != LANGUAGE_DEFAULT && isset($this->decorated->values[$name]) && is_array($this->decorated->values[$name])) {
+        if (isset($this->decorated->values[$name][LANGUAGE_DEFAULT]) && !isset($this->decorated->values[$name][$langcode])) {
+          $this->decorated->values[$name][$langcode] = &$this->decorated->values[$name][LANGUAGE_DEFAULT];
+        }
+      }
+      if (!isset($this->decorated->values[$name])) {
+        $this->decorated->values[$name] = NULL;
+      }
+      return $this->decorated->values[$name];
     }
-    return $this->decorated->values[$name];
   }
 
   /**
@@ -119,20 +151,36 @@ public function &__get($name) {
    * Directly writes to the plain field values, as done by Drupal 7.
    */
   public function __set($name, $value) {
-    if (is_array($value) && $definition = $this->decorated->getPropertyDefinition($name)) {
-      // If field API sets a value with a langcode in entity language, move it
-      // to LANGUAGE_DEFAULT.
-      // This is necessary as EntityNG does key values in default language always
-      // with LANGUAGE_DEFAULT while field API expects them to be keyed by
-      // langcode.
-      foreach ($value as $langcode => $data) {
-        if ($langcode != LANGUAGE_DEFAULT && $langcode == $this->decorated->language()->langcode) {
-          $value[LANGUAGE_DEFAULT] = $data;
-          unset($value[$langcode]);
+
+    // The property revision was used to create a new revision - do so as well.
+    // @TODO Did this apply only to node or for other entity types too?
+    if ($name == 'revision') {
+      $this->setNewRevision($value);
+    }
+
+    $defined = isset($this->definitions[$name]);
+    // When updating values for entity properties that have been converted to
+    // an entity field, directly write to the plain value. This makes it
+    // possible to use the BC-decorator with properties; e.g., $node->title.
+    if ($defined && empty($this->definitions[$name]['configurable'])) {
+      $this->decorated->values[$name][LANGUAGE_DEFAULT] = $value;
+    }
+    else {
+      if ($defined && is_array($value)) {
+        // If field API sets a value with a langcode in entity language, move it
+        // to LANGUAGE_DEFAULT.
+        // This is necessary as EntityNG does key values in default language always
+        // with LANGUAGE_DEFAULT while field API expects them to be keyed by
+        // langcode.
+        foreach ($value as $langcode => $data) {
+          if ($langcode != LANGUAGE_DEFAULT && $langcode == $this->decorated->language()->langcode) {
+            $value[LANGUAGE_DEFAULT] = $data;
+            unset($value[$langcode]);
+          }
         }
       }
+      $this->decorated->values[$name] = $value;
     }
-    $this->decorated->values[$name] = $value;
     // Remove the field object to avoid the field object and the value getting
     // out of sync. That way, the next field object instantiated by EntityNG
     // will hold the updated value.
@@ -144,7 +192,26 @@ public function __set($name, $value) {
    */
   public function __isset($name) {
     $value = $this->__get($name);
-    return isset($value);
+    // Horrible code but necessary because non existing properties are
+    // initialized with the value NULL.
+    if (($isset = isset($value)) && is_array($value)) {
+      $isset = FALSE;
+      foreach ($value as $langcode => $data) {
+        if (is_array($data)) {
+          foreach ($data as $delta => $value) {
+            if (!is_null($value)) {
+              $isset = TRUE;
+              break(2);
+            }
+          }
+        }
+        else {
+          $isset = !empty($data);
+          break;
+        }
+      }
+    }
+    return $isset;
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Entity/EntityFormControllerNG.php b/core/lib/Drupal/Core/Entity/EntityFormControllerNG.php
index ef9bc89..a3ccf13 100644
--- a/core/lib/Drupal/Core/Entity/EntityFormControllerNG.php
+++ b/core/lib/Drupal/Core/Entity/EntityFormControllerNG.php
@@ -78,7 +78,8 @@ public function buildEntity(array $form, array &$form_state) {
     $translation = $entity->getTranslation($this->getFormLangcode($form_state), FALSE);
     $definitions = $translation->getPropertyDefinitions();
     foreach ($values_excluding_fields as $key => $value) {
-      if (isset($definitions[$key])) {
+      // @TODO Remove EntityBCDecorator condition once the decorator is removed.
+      if (isset($definitions[$key]) || $entity instanceof EntityBCDecorator) {
         $translation->$key = $value;
       }
     }
diff --git a/core/lib/Drupal/Core/Entity/EntityNG.php b/core/lib/Drupal/Core/Entity/EntityNG.php
index 8763f6d..70ac362 100644
--- a/core/lib/Drupal/Core/Entity/EntityNG.php
+++ b/core/lib/Drupal/Core/Entity/EntityNG.php
@@ -81,6 +81,11 @@ public function __construct(array $values, $entity_type, $bundle = FALSE) {
     $this->entityType = $entity_type;
     $this->bundle = $bundle ? $bundle : $this->entityType;
     foreach ($values as $key => $value) {
+      // If the key matches an existing property set the value to the property
+      // to ensure non converted properties have the correct value.
+      if (property_exists($this, $key) && isset($value[LANGUAGE_DEFAULT])) {
+        $this->$key = $value[LANGUAGE_DEFAULT];
+      }
       $this->values[$key] = $value;
     }
     $this->init();
@@ -269,7 +274,7 @@ public function language() {
     if ($this->getPropertyDefinition('langcode')) {
       $language = $this->get('langcode')->language;
     }
-    if (!isset($language)) {
+    if (empty($language)) {
       // Make sure we return a proper language object.
       $language = new Language(array('langcode' => LANGUAGE_NOT_SPECIFIED));
     }
@@ -367,7 +372,9 @@ public function translations() {
    */
   public function getBCEntity() {
     if (!isset($this->bcEntity)) {
-      $this->bcEntity = new EntityBCDecorator($this);
+      // Initialize field definitions so that we can pass them by reference.
+      $this->getPropertyDefinitions();
+      $this->bcEntity = new EntityBCDecorator($this, $this->fieldDefinitions);
     }
     return $this->bcEntity;
   }
@@ -483,6 +490,12 @@ public function createDuplicate() {
       $uuid = new Uuid();
       $duplicate->{$entity_info['entity_keys']['uuid']}->value = $uuid->generate();
     }
+
+    // Check whether the entity type supports revisions and initialize it if so.
+    if (!empty($entity_info['entity_keys']['revision'])) {
+      $duplicate->{$entity_info['entity_keys']['revision']}->value = NULL;
+    }
+
     return $duplicate;
   }
 
diff --git a/core/lib/Drupal/Core/Entity/Field/FieldItemBase.php b/core/lib/Drupal/Core/Entity/Field/FieldItemBase.php
index 4159f04..62edc8d 100644
--- a/core/lib/Drupal/Core/Entity/Field/FieldItemBase.php
+++ b/core/lib/Drupal/Core/Entity/Field/FieldItemBase.php
@@ -37,6 +37,15 @@
   protected $properties = array();
 
   /**
+   * Holds any non-property values that get set on the object.
+   *
+   * @todo: Remove or refactor once EntityNG conversion is complete.
+   *
+   * @var array
+   */
+  protected $extraValues = array();
+
+  /**
    * Overrides ContextAwareTypedData::__construct().
    */
   public function __construct(array $definition, $name = NULL, ContextAwareInterface $parent = NULL) {
@@ -68,7 +77,7 @@ public function getValue() {
     foreach ($this->getProperties() as $name => $property) {
       $values[$name] = $property->getValue();
     }
-    return $values;
+    return $values + $this->extraValues;
   }
 
   /**
@@ -92,9 +101,11 @@ public function setValue($values) {
       else {
         $property->setValue(NULL);
       }
+      unset($values[$name]);
     }
     // @todo: Throw an exception for invalid values once conversion is
     // totally completed.
+    $this->extraValues = $values;
   }
 
   /**
@@ -129,7 +140,13 @@ public function set($property_name, $value) {
    * Implements \Drupal\Core\Entity\Field\FieldItemInterface::__get().
    */
   public function __get($name) {
-    return $this->get($name)->getValue();
+    if (isset($this->properties[$name])) {
+      return $this->properties[$name]->getValue();
+    }
+    // The property is unknown, so try to get it from the extra values.
+    elseif (isset($this->extraValues[$name])) {
+      return $this->extraValues[$name];
+    }
   }
 
   /**
@@ -140,7 +157,13 @@ public function __set($name, $value) {
     if ($value instanceof TypedDataInterface) {
       $value = $value->getValue();
     }
-    $this->get($name)->setValue($value);
+    if (isset($this->properties[$name])) {
+      $this->properties[$name]->setValue($value);
+    }
+    else {
+      // The property is unknown, so set it to the extra values.
+      $this->extraValues[$name] = $value;
+    }
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Entity/Field/Type/EntityReferenceItem.php b/core/lib/Drupal/Core/Entity/Field/Type/EntityReferenceItem.php
index 496a720..afe45ba 100644
--- a/core/lib/Drupal/Core/Entity/Field/Type/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Entity/Field/Type/EntityReferenceItem.php
@@ -92,4 +92,13 @@ public function get($property_name) {
     $property_name = ($property_name == 'value') ? 'target_id' : $property_name;
     return parent::get($property_name);
   }
+
+  /**
+   * Implements \Drupal\Core\Entity\Field\FieldItemInterface::__isset().
+   */
+  public function __isset($property_name) {
+    $property_name = ($property_name == 'value') ? 'target_id' : $property_name;
+    return parent::__isset($property_name);
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php b/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
index 691868d..39f78e1 100644
--- a/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
+++ b/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
@@ -54,6 +54,13 @@ class EntityWrapper extends ContextAwareTypedData implements IteratorAggregate,
   protected $id;
 
   /**
+   * If set, a new entity to create and reference.
+   *
+   * @var \Drupal\Core\Entity\EntityInterface
+   */
+  protected $newEntity;
+
+  /**
    * Overrides ContextAwareTypedData::__construct().
    */
   public function __construct(array $definition, $name = NULL, ContextAwareInterface $parent = NULL) {
@@ -65,6 +72,9 @@ public function __construct(array $definition, $name = NULL, ContextAwareInterfa
    * Overrides \Drupal\Core\TypedData\TypedData::getValue().
    */
   public function getValue() {
+    if (isset($this->newEntity)) {
+      return $this->newEntity;
+    }
     $source = $this->getIdSource();
     $id = $source ? $source->getValue() : $this->id;
     return $id ? entity_load($this->entityType, $id) : NULL;
@@ -85,10 +95,16 @@ protected function getIdSource() {
    * Both the entity ID and the entity object may be passed as value.
    */
   public function setValue($value) {
-    // Support passing in the entity object.
-    if ($value instanceof EntityInterface) {
+    // Support passing in the entity object. If it's not yet saved we have
+    // to store the whole entity such that it could be saved later on.
+    if ($value instanceof EntityInterface && $value->isNew()) {
+      $this->newEntity = $value;
       $this->entityType = $value->entityType();
+      $value = FALSE;
+    }
+    elseif ($value instanceof EntityInterface) {
       $value = $value->id();
+      unset($this->newEntity);
     }
     elseif (isset($value) && !(is_scalar($value) && !empty($this->definition['constraints']['EntityType']))) {
       throw new InvalidArgumentException('Value is not a valid entity.');
diff --git a/core/lib/Drupal/Core/TypedData/Type/Language.php b/core/lib/Drupal/Core/TypedData/Type/Language.php
index ac84070..57d5ae2 100644
--- a/core/lib/Drupal/Core/TypedData/Type/Language.php
+++ b/core/lib/Drupal/Core/TypedData/Type/Language.php
@@ -8,8 +8,10 @@
 namespace Drupal\Core\TypedData\Type;
 
 use InvalidArgumentException;
+use Drupal\Core\Language\Language as LanguageObject;
 use Drupal\Core\TypedData\ContextAwareTypedData;
 
+
 /**
  * Defines the 'language' data type.
  *
@@ -40,7 +42,8 @@ public function getValue() {
     $source = $this->getLanguageCodeSource();
     $langcode = $source ? $source->getValue() : $this->langcode;
     if ($langcode) {
-      return language_load($langcode);
+      $language = language_load($langcode);
+      return $language ?: new LanguageObject(array('langcode' => $this->langcode));
     }
   }
 
diff --git a/core/modules/book/book.admin.inc b/core/modules/book/book.admin.inc
index d112180..2be14c7 100644
--- a/core/modules/book/book.admin.inc
+++ b/core/modules/book/book.admin.inc
@@ -5,7 +5,7 @@
  * Administration page callbacks for the Book module.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Page callback: Returns an administrative overview of all books.
@@ -101,7 +101,7 @@ function book_admin_settings_submit($form, &$form_state) {
 /**
  * Form constructor for administering a single book's hierarchy.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node of the top-level page in the book.
  *
  * @see book_menu()
@@ -109,7 +109,7 @@ function book_admin_settings_submit($form, &$form_state) {
  * @see book_admin_edit_submit()
  * @ingroup forms
  */
-function book_admin_edit($form, $form_state, Node $node) {
+function book_admin_edit($form, $form_state, EntityInterface $node) {
   drupal_set_title($node->label());
   $form['#node'] = $node;
   _book_admin_table($node, $form);
@@ -182,14 +182,14 @@ function book_admin_edit_submit($form, &$form_state) {
 /**
  * Builds the table portion of the form for the book administration page.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node of the top-level page in the book.
  * @param $form
  *   The form that is being modified, passed by reference.
  *
  * @see book_admin_edit()
  */
-function _book_admin_table(Node $node, &$form) {
+function _book_admin_table(EntityInterface $node, &$form) {
   $form['table'] = array(
     '#theme' => 'book_admin_table',
     '#tree' => TRUE,
diff --git a/core/modules/book/book.module b/core/modules/book/book.module
index 106a57a..65ed3db 100644
--- a/core/modules/book/book.module
+++ b/core/modules/book/book.module
@@ -5,7 +5,7 @@
  * Allows users to create and organize related content in an outline.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 use Drupal\Core\Template\Attribute;
 use Drupal\menu_link\Plugin\Core\Entity\MenuLink;
@@ -89,12 +89,12 @@ function book_permission() {
 /**
  * Adds relevant book links to the node's links.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The book page node to add links to.
  * @param $view_mode
  *   The view mode of the node.
  */
-function book_node_view_link(Node $node, $view_mode) {
+function book_node_view_link(EntityInterface $node, $view_mode) {
   $links = array();
 
   if (isset($node->book['depth'])) {
@@ -201,10 +201,10 @@ function book_menu() {
 /**
  * Access callback: Determines if the book export page is accessible.
  *
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\node\Plugin\Core\Entity\EntityInterface $node
  *   The node whose export page is to be viewed.
  */
-function book_export_access(Node $node) {
+function book_export_access(EntityInterface $node) {
   return user_access('access printer-friendly version') && node_access('view', $node);
 }
 
@@ -215,24 +215,24 @@ function book_export_access(Node $node) {
  * - admin/content/book/%node
  * - node/%node/outline
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node whose outline tab is to be viewed.
  *
  * @see book_menu()
  */
-function _book_outline_access(Node $node) {
+function _book_outline_access(EntityInterface $node) {
   return user_access('administer book outlines') && node_access('view', $node);
 }
 
 /**
  * Access callback: Determines if the user can remove nodes from the outline.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to remove from the outline.
  *
  * @see book_menu()
  */
-function _book_outline_remove_access(Node $node) {
+function _book_outline_remove_access(EntityInterface $node) {
   return _book_node_is_removable($node) && _book_outline_access($node);
 }
 
@@ -242,7 +242,7 @@ function _book_outline_remove_access(Node $node) {
  * A node can be removed from a book if it is actually in a book and it either
  * is not a top-level page or is a top-level page with no children.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to remove from the outline.
  */
 function _book_node_is_removable($node) {
@@ -422,10 +422,10 @@ function _book_parent_select($book_link) {
 /**
  * Builds the common elements of the book form for the node and outline forms.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node whose form is being viewed.
  */
-function _book_add_form_elements(&$form, &$form_state, Node $node) {
+function _book_add_form_elements(&$form, &$form_state, EntityInterface $node) {
   // If the form is being processed during the Ajax callback of our book bid
   // dropdown, then $form_state will hold the value that was selected.
   if (isset($form_state['values']['book'])) {
@@ -525,13 +525,13 @@ function book_form_update($form, $form_state) {
  * outline through node addition, node editing, node deletion, or the outline
  * tab.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being saved, added, deleted, or moved.
  *
  * @return
  *   TRUE if the menu link was saved; FALSE otherwise.
  */
-function _book_update_outline(Node $node) {
+function _book_update_outline(EntityInterface $node) {
   if (empty($node->book['bid'])) {
     return FALSE;
   }
@@ -790,7 +790,7 @@ function book_node_load($nodes, $types) {
 /**
  * Implements hook_node_view().
  */
-function book_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function book_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   if ($view_mode == 'full') {
     if (!empty($node->book['bid']) && empty($node->in_preview)) {
       $node->content['book_navigation'] = array(
@@ -822,7 +822,7 @@ function book_page_alter(&$page) {
 /**
  * Implements hook_node_presave().
  */
-function book_node_presave(Node $node) {
+function book_node_presave(EntityInterface $node) {
   // Always save a revision for non-administrators.
   if (!empty($node->book['bid']) && !user_access('administer nodes')) {
     $node->setNewRevision();
@@ -836,7 +836,7 @@ function book_node_presave(Node $node) {
 /**
  * Implements hook_node_insert().
  */
-function book_node_insert(Node $node) {
+function book_node_insert(EntityInterface $node) {
   if (!empty($node->book['bid'])) {
     if ($node->book['bid'] == 'new') {
       // New nodes that are their own book.
@@ -851,7 +851,7 @@ function book_node_insert(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function book_node_update(Node $node) {
+function book_node_update(EntityInterface $node) {
   if (!empty($node->book['bid'])) {
     if ($node->book['bid'] == 'new') {
       // New nodes that are their own book.
@@ -866,7 +866,7 @@ function book_node_update(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function book_node_predelete(Node $node) {
+function book_node_predelete(EntityInterface $node) {
   if (!empty($node->book['bid'])) {
     if ($node->nid == $node->book['bid']) {
       // Handle deletion of a top-level post.
@@ -890,7 +890,7 @@ function book_node_predelete(Node $node) {
 /**
  * Implements hook_node_prepare().
  */
-function book_node_prepare(Node $node) {
+function book_node_prepare(EntityInterface $node) {
   // Prepare defaults for the add/edit form.
   if (empty($node->book) && (user_access('add content to books') || user_access('administer book outlines'))) {
     $node->book = array();
@@ -1186,7 +1186,7 @@ function book_export_traverse($tree, $visit_func) {
 /**
  * Generates printer-friendly HTML for a node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that will be output.
  * @param $children
  *   (optional) All the rendered child nodes within the current node. Defaults
@@ -1197,7 +1197,7 @@ function book_export_traverse($tree, $visit_func) {
  *
  * @see book_export_traverse()
  */
-function book_node_export(Node $node, $children = '') {
+function book_node_export(EntityInterface $node, $children = '') {
   $build = node_view($node, 'print');
   unset($build['#theme']);
   // @todo Rendering should happen in the template using render().
diff --git a/core/modules/book/book.pages.inc b/core/modules/book/book.pages.inc
index a971aa6..2418591 100644
--- a/core/modules/book/book.pages.inc
+++ b/core/modules/book/book.pages.inc
@@ -5,7 +5,7 @@
  * User page callbacks for the book module.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
@@ -39,7 +39,7 @@ function book_render() {
  *   currently supported in book module:
  *   - html: Printer-friendly HTML.
  *   Other types may be supported in contributed modules.
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\node\Plugin\Core\Entity\EntityInterface $node
  *   The node to export.
  *
  * @return
@@ -50,7 +50,7 @@ function book_render() {
  *
  * @see book_menu()
  */
-function book_export($type, Node $node) {
+function book_export($type, EntityInterface $node) {
   $type = drupal_strtolower($type);
 
   $export_function = 'book_export_' . $type;
@@ -84,7 +84,7 @@ function book_export($type, Node $node) {
  * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
  * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
  */
-function book_export_html(Node $node) {
+function book_export_html(EntityInterface $node) {
   if (user_access('access printer-friendly version')) {
     if (isset($node->book)) {
       $tree = book_menu_subtree_data($node->book);
@@ -103,7 +103,7 @@ function book_export_html(Node $node) {
 /**
  * Page callback: Shows the outline form for a single node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The book node for which to show the outline.
  *
  * @return string
@@ -111,7 +111,7 @@ function book_export_html(Node $node) {
  *
  * @see book_menu()
  */
-function book_outline(Node $node) {
+function book_outline(EntityInterface $node) {
   drupal_set_title($node->label());
   return drupal_get_form('book_outline_form', $node);
 }
@@ -121,14 +121,14 @@ function book_outline(Node $node) {
  *
  * Allows handling of all book outline operations via the outline tab.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The book node for which to show the outline.
  *
  * @see book_outline_form_submit()
  * @see book_remove_button_submit()
  * @ingroup forms
  */
-function book_outline_form($form, &$form_state, Node $node) {
+function book_outline_form($form, &$form_state, EntityInterface $node) {
   if (!isset($node->book)) {
     // The node is not part of any book yet - set default options.
     $node->book = _book_link_defaults($node->nid);
@@ -208,14 +208,14 @@ function book_outline_form_submit($form, &$form_state) {
 /**
  * Form constructor to confirm removal of a node from a book.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to delete.
  *
  * @see book_remove_form_submit()
  * @see book_menu()
  * @ingroup forms
  */
-function book_remove_form($form, &$form_state, Node $node) {
+function book_remove_form($form, &$form_state, EntityInterface $node) {
   $form['#node'] = $node;
   $title = array('%title' => $node->label());
 
diff --git a/core/modules/book/lib/Drupal/book/Tests/BookTest.php b/core/modules/book/lib/Drupal/book/Tests/BookTest.php
index 2bc08b8..210066a 100644
--- a/core/modules/book/lib/Drupal/book/Tests/BookTest.php
+++ b/core/modules/book/lib/Drupal/book/Tests/BookTest.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\book\Tests;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -145,7 +145,7 @@ function testBook() {
    *
    * Also checks the printer friendly version of the outline.
    *
-   * @param Drupal\node\Node $node
+   * @param \Drupal\Core\Entity\EntityInterface $node
    *   Node to check.
    * @param $nodes
    *   Nodes that should be in outline.
@@ -158,7 +158,7 @@ function testBook() {
    * @param array $breadcrumb
    *   The nodes that should be displayed in the breadcrumb.
    */
-  function checkBookNode(Node $node, $nodes, $previous = FALSE, $up = FALSE, $next = FALSE, array $breadcrumb) {
+  function checkBookNode(EntityInterface $node, $nodes, $previous = FALSE, $up = FALSE, $next = FALSE, array $breadcrumb) {
     // $number does not use drupal_static as it should not be reset
     // since it uniquely identifies each call to checkBookNode().
     static $number = 0;
diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index 6f2795a..29aedc0 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -9,7 +9,6 @@
  * book page, etc.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 use Drupal\file\Plugin\Core\Entity\File;
 use Drupal\Core\Entity\EntityInterface;
@@ -494,13 +493,13 @@ function comment_get_recent($number = 10) {
  *   Number of comments.
  * @param $new_replies
  *   Number of new replies.
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The first new comment node.
  *
  * @return
  *   "page=X" if the page number is greater than zero; empty string otherwise.
  */
-function comment_new_page_count($num_comments, $new_replies, Node $node) {
+function comment_new_page_count($num_comments, $new_replies, EntityInterface $node) {
   $mode = variable_get('comment_default_mode_' . $node->type, COMMENT_MODE_THREADED);
   $comments_per_page = variable_get('comment_default_per_page_' . $node->type, 50);
   $pagenum = NULL;
@@ -578,7 +577,7 @@ function theme_comment_block($variables) {
 /**
  * Implements hook_node_view().
  */
-function comment_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function comment_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   $links = array();
 
   if ($node->comment != COMMENT_NODE_HIDDEN) {
@@ -686,14 +685,14 @@ function comment_node_view(Node $node, EntityDisplay $display, $view_mode) {
 /**
  * Builds the comment-related elements for node detail pages.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity for which to build the comment-related elements.
  *
  * @return
  *   A renderable array representing the comment-related page elements for the
  *   node.
  */
-function comment_node_page_additions(Node $node) {
+function comment_node_page_additions(EntityInterface $node) {
   $additions = array();
 
   // Only attempt to render comments if the node has visible comments.
@@ -731,7 +730,7 @@ function comment_node_page_additions(Node $node) {
 /**
  * Returns a rendered form to comment the given node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity to be commented.
  * @param int $pid
  *   (optional) Some comments are replies to other comments. In those cases,
@@ -740,7 +739,7 @@ function comment_node_page_additions(Node $node) {
  * @return array
  *   The renderable array for the comment addition form.
  */
-function comment_add(Node $node, $pid = NULL) {
+function comment_add(EntityInterface $node, $pid = NULL) {
   $values = array('nid' => $node->nid, 'pid' => $pid, 'node_type' => 'comment_node_' . $node->type);
   $comment = entity_create('comment', $values);
   return entity_get_form($comment);
@@ -749,7 +748,7 @@ function comment_add(Node $node, $pid = NULL) {
 /**
  * Retrieves comments for a thread.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node whose comment(s) needs rendering.
  * @param $mode
  *   The comment display mode; COMMENT_MODE_FLAT or COMMENT_MODE_THREADED.
@@ -813,7 +812,7 @@ function comment_add(Node $node, $pid = NULL) {
  * spoil the reverse ordering, "ORDER BY thread ASC" -- here, we do not need
  * to consider the trailing "/" so we use a substring only.
  */
-function comment_get_thread(Node $node, $mode, $comments_per_page) {
+function comment_get_thread(EntityInterface $node, $mode, $comments_per_page) {
   $query = db_select('comment', 'c')
     ->extend('Drupal\Core\Database\Query\PagerSelectExtender');
   $query->addField('c', 'cid');
@@ -923,13 +922,13 @@ function comment_view(Comment $comment, $view_mode = 'full', $langcode = NULL) {
  *
  * @param Drupal\comment\Comment $comment
  *   The comment object.
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node the comment is attached to.
  *
  * @return
  *   A structured array of links.
  */
-function comment_links(Comment $comment, Node $node) {
+function comment_links(Comment $comment, EntityInterface $node) {
   $links = array();
   if ($node->comment == COMMENT_NODE_OPEN) {
     if (user_access('administer comments') && user_access('post comments')) {
@@ -1203,7 +1202,7 @@ function comment_node_load($nodes, $types) {
 /**
  * Implements hook_node_prepare().
  */
-function comment_node_prepare(Node $node) {
+function comment_node_prepare(EntityInterface $node) {
   if (!isset($node->comment)) {
     $node->comment = variable_get("comment_$node->type", COMMENT_NODE_OPEN);
   }
@@ -1212,7 +1211,7 @@ function comment_node_prepare(Node $node) {
 /**
  * Implements hook_node_insert().
  */
-function comment_node_insert(Node $node) {
+function comment_node_insert(EntityInterface $node) {
   // Allow bulk updates and inserts to temporarily disable the
   // maintenance of the {node_comment_statistics} table.
   if (variable_get('comment_maintain_node_statistics', TRUE)) {
@@ -1232,7 +1231,7 @@ function comment_node_insert(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function comment_node_predelete(Node $node) {
+function comment_node_predelete(EntityInterface $node) {
   $cids = db_query('SELECT cid FROM {comment} WHERE nid = :nid', array(':nid' => $node->nid))->fetchCol();
   comment_delete_multiple($cids);
   db_delete('node_comment_statistics')
@@ -1243,7 +1242,7 @@ function comment_node_predelete(Node $node) {
 /**
  * Implements hook_node_update_index().
  */
-function comment_node_update_index(Node $node, $langcode) {
+function comment_node_update_index(EntityInterface $node, $langcode) {
   $index_comments = &drupal_static(__FUNCTION__);
 
   if ($index_comments === NULL) {
@@ -1292,7 +1291,7 @@ function comment_update_index() {
  * Formats a comment count string and returns it, for display with search
  * results.
  */
-function comment_node_search_result(Node $node) {
+function comment_node_search_result(EntityInterface $node) {
   // Do not make a string if comments are hidden.
   if (user_access('access comments') && $node->comment != COMMENT_NODE_HIDDEN) {
     $comments = db_query('SELECT comment_count FROM {node_comment_statistics} WHERE nid = :nid', array('nid' => $node->nid))->fetchField();
diff --git a/core/modules/comment/comment.pages.inc b/core/modules/comment/comment.pages.inc
index da359a4..be4ef3f 100644
--- a/core/modules/comment/comment.pages.inc
+++ b/core/modules/comment/comment.pages.inc
@@ -5,7 +5,7 @@
  * User page callbacks for the Comment module.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
@@ -21,7 +21,7 @@
  * The node or comment that is being replied to must appear above the comment
  * form to provide the user context while authoring the comment.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   Every comment belongs to a node. This is that node.
  * @param $pid
  *   (optional) Some comments are replies to other comments. In those cases,
@@ -34,7 +34,7 @@
  *     - comment_parent: If the comment is a reply to another comment.
  *   - comment_form: The comment form as a renderable array.
  */
-function comment_reply(Node $node, $pid = NULL) {
+function comment_reply(EntityInterface $node, $pid = NULL) {
   // Set the breadcrumb trail.
   drupal_set_breadcrumb(array(l(t('Home'), NULL), l($node->label(), 'node/' . $node->nid)));
   $op = isset($_POST['op']) ? $_POST['op'] : '';
diff --git a/core/modules/comment/lib/Drupal/comment/CommentStorageController.php b/core/modules/comment/lib/Drupal/comment/CommentStorageController.php
index 6851be0..7f01ea6 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentStorageController.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentStorageController.php
@@ -56,7 +56,7 @@ protected function attachLoad(&$records, $load_revision = FALSE) {
    */
   public function create(array $values) {
     if (empty($values['node_type']) && !empty($values['nid'])) {
-      $node = node_load($values['nid']);
+      $node = node_load(is_object($values['nid']) ? $values['nid']->value : $values['nid']);
       $values['node_type'] = 'comment_node_' . $node->type;
     }
     return parent::create($values);
diff --git a/core/modules/comment/lib/Drupal/comment/Tests/CommentTestBase.php b/core/modules/comment/lib/Drupal/comment/Tests/CommentTestBase.php
index 253136e..f735871 100644
--- a/core/modules/comment/lib/Drupal/comment/Tests/CommentTestBase.php
+++ b/core/modules/comment/lib/Drupal/comment/Tests/CommentTestBase.php
@@ -80,7 +80,7 @@ function setUp() {
   /**
    * Posts a comment.
    *
-   * @param Drupal\node\Node|null $node
+   * @param \Drupal\Core\Entity\EntityInterface $node|null $node
    *   Node to post comment on or NULL to post to the previusly loaded page.
    * @param $comment
    *   Comment body.
diff --git a/core/modules/editor/lib/Drupal/editor/Tests/EditorLoadingTest.php b/core/modules/editor/lib/Drupal/editor/Tests/EditorLoadingTest.php
index 755c2c0..e885ac4 100644
--- a/core/modules/editor/lib/Drupal/editor/Tests/EditorLoadingTest.php
+++ b/core/modules/editor/lib/Drupal/editor/Tests/EditorLoadingTest.php
@@ -137,9 +137,9 @@ function testLoading() {
     // to let the untrusted user edit it.
     $this->drupalCreateNode(array(
       'type' => 'article',
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(
-        0 => array('value' => $this->randomName(32), 'format' => 'full_html')
-      )),
+      'body' => array(
+        array('value' => $this->randomName(32), 'format' => 'full_html')
+      ),
     ));
 
     // The untrusted user tries to edit content that is written in a text format
diff --git a/core/modules/field/lib/Drupal/field/Tests/FieldAccessTest.php b/core/modules/field/lib/Drupal/field/Tests/FieldAccessTest.php
index bc1a380..86f1f34 100644
--- a/core/modules/field/lib/Drupal/field/Tests/FieldAccessTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/FieldAccessTest.php
@@ -64,7 +64,7 @@ function setUp() {
     $settings = array();
     $settings['type'] = $this->content_type;
     $settings['title'] = 'Field view access test';
-    $settings['test_view_field'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $this->test_view_field_value)));
+    $settings['test_view_field'] = array(array('value' => $this->test_view_field_value));
     $this->node = $this->drupalCreateNode($settings);
   }
 
diff --git a/core/modules/field/lib/Drupal/field/Tests/Views/ApiDataTest.php b/core/modules/field/lib/Drupal/field/Tests/Views/ApiDataTest.php
index 417b836..1f4afe8 100644
--- a/core/modules/field/lib/Drupal/field/Tests/Views/ApiDataTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/Views/ApiDataTest.php
@@ -28,8 +28,6 @@ public static function getInfo() {
   function setUp() {
     parent::setUp();
 
-    $langcode = LANGUAGE_NOT_SPECIFIED;
-
     $field_names = $this->setUpFields();
 
     // The first one will be attached to nodes only.
@@ -66,8 +64,8 @@ function setUp() {
     for ($i = 0; $i < 5; $i++) {
       $edit = array(
         // @TODO Write a helper method to create such values.
-        'field_name_0' => array($langcode => array((array('value' => $this->randomName())))),
-        'field_name_2' => array($langcode => array((array('value' => $this->randomName())))),
+        'field_name_0' => array((array('value' => $this->randomName()))),
+        'field_name_2' => array((array('value' => $this->randomName()))),
       );
       $this->nodes[] = $this->drupalCreateNode($edit);
     }
diff --git a/core/modules/field/lib/Drupal/field/Tests/Views/HandlerFieldFieldTest.php b/core/modules/field/lib/Drupal/field/Tests/Views/HandlerFieldFieldTest.php
index 1c8d3f5..5e50b88 100644
--- a/core/modules/field/lib/Drupal/field/Tests/Views/HandlerFieldFieldTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/Views/HandlerFieldFieldTest.php
@@ -59,13 +59,13 @@ protected function setUp() {
 
       for ($key = 0; $key < 3; $key++) {
         $field = $this->fields[$key];
-        $edit[$field['field_name']][LANGUAGE_NOT_SPECIFIED][0]['value'] = $this->randomName(8);
+        $edit[$field['field_name']][0]['value'] = $this->randomName(8);
       }
       for ($j = 0; $j < 5; $j++) {
-        $edit[$this->fields[3]['field_name']][LANGUAGE_NOT_SPECIFIED][$j]['value'] = $this->randomName(8);
+        $edit[$this->fields[3]['field_name']][$j]['value'] = $this->randomName(8);
       }
       // Set this field to be empty.
-      $edit[$this->fields[4]['field_name']] = array(LANGUAGE_NOT_SPECIFIED => array(0 => array('value' => NULL)));
+      $edit[$this->fields[4]['field_name']] = array(array('value' => NULL));
 
       $this->nodes[$i] = $this->drupalCreateNode($edit);
     }
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
index 45de66e..4ca882b 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\field_ui\Tests;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Tests the functionality of the 'Manage display' screens.
@@ -111,7 +111,7 @@ function testViewModeCustom() {
     $value = 12345;
     $settings = array(
       'type' => $this->type,
-      'field_test' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $value))),
+      'field_test' => array(array('value' => $value)),
     );
     $node = $this->drupalCreateNode($settings);
 
@@ -216,7 +216,7 @@ function testNoFieldsDisplayOverview() {
   /**
    * Asserts that a string is found in the rendered node in a view mode.
    *
-   * @param Node $node
+   * @param EntityInterface $node
    *   The node.
    * @param $view_mode
    *   The view mode in which the node should be displayed.
@@ -228,14 +228,14 @@ function testNoFieldsDisplayOverview() {
    * @return
    *   TRUE on pass, FALSE on fail.
    */
-  function assertNodeViewText(Node $node, $view_mode, $text, $message) {
+  function assertNodeViewText(EntityInterface $node, $view_mode, $text, $message) {
     return $this->assertNodeViewTextHelper($node, $view_mode, $text, $message, FALSE);
   }
 
   /**
    * Asserts that a string is not found in the rendered node in a view mode.
    *
-   * @param Node $node
+   * @param EntityInterface $node
    *   The node.
    * @param $view_mode
    *   The view mode in which the node should be displayed.
@@ -246,7 +246,7 @@ function assertNodeViewText(Node $node, $view_mode, $text, $message) {
    * @return
    *   TRUE on pass, FALSE on fail.
    */
-  function assertNodeViewNoText(Node $node, $view_mode, $text, $message) {
+  function assertNodeViewNoText(EntityInterface $node, $view_mode, $text, $message) {
     return $this->assertNodeViewTextHelper($node, $view_mode, $text, $message, TRUE);
   }
 
@@ -256,7 +256,7 @@ function assertNodeViewNoText(Node $node, $view_mode, $text, $message) {
    * This helper function is used by assertNodeViewText() and
    * assertNodeViewNoText().
    *
-   * @param Node $node
+   * @param EntityInterface $node
    *   The node.
    * @param $view_mode
    *   The view mode in which the node should be displayed.
@@ -270,7 +270,7 @@ function assertNodeViewNoText(Node $node, $view_mode, $text, $message) {
    * @return
    *   TRUE on pass, FALSE on fail.
    */
-  function assertNodeViewTextHelper(Node $node, $view_mode, $text, $message, $not_exists) {
+  function assertNodeViewTextHelper(EntityInterface $node, $view_mode, $text, $message, $not_exists) {
     // Make sure caches on the tester side are refreshed after changes
     // submitted on the tested side.
     field_info_cache_clear();
diff --git a/core/modules/file/lib/Drupal/file/Tests/FileFieldTestBase.php b/core/modules/file/lib/Drupal/file/Tests/FileFieldTestBase.php
index 52df6f2..c2d922d 100644
--- a/core/modules/file/lib/Drupal/file/Tests/FileFieldTestBase.php
+++ b/core/modules/file/lib/Drupal/file/Tests/FileFieldTestBase.php
@@ -141,7 +141,8 @@ function uploadNodeFile($file, $field_name, $nid_or_type, $new_revision = TRUE,
       $node = $this->drupalCreateNode($extras);
       $nid = $node->nid;
       // Save at least one revision to better simulate a real site.
-      $this->drupalCreateNode(get_object_vars($node));
+      $node->setNewRevision();
+      $node->save();
       $node = node_load($nid, TRUE);
       $this->assertNotEqual($nid, $node->vid, t('Node revision exists.'));
     }
diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 872eb95..f0434fb 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -6,7 +6,6 @@
  */
 
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\node\Plugin\Core\Entity\Node;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 use Drupal\taxonomy\Plugin\Core\Entity\Term;
 
@@ -242,13 +241,13 @@ function forum_uri($forum) {
 /**
  * Checks whether a node can be used in a forum, based on its content type.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  *
  * @return
  *   Boolean indicating if the node can be assigned to a forum.
  */
-function _forum_node_check_node_type(Node $node) {
+function _forum_node_check_node_type(EntityInterface $node) {
   // Fetch information about the forum field.
   $instance = field_info_instance('node', 'taxonomy_forums', $node->type);
   return !empty($instance);
@@ -257,7 +256,7 @@ function _forum_node_check_node_type(Node $node) {
 /**
  * Implements hook_node_view().
  */
-function forum_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function forum_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   $vid = config('forum.settings')->get('vocabulary');
   $vocabulary = taxonomy_vocabulary_load($vid);
   if (_forum_node_check_node_type($node)) {
@@ -283,7 +282,7 @@ function forum_node_view(Node $node, EntityDisplay $display, $view_mode) {
  * Checks in particular that the node is assigned only a "leaf" term in the
  * forum taxonomy.
  */
-function forum_node_validate(Node $node, $form) {
+function forum_node_validate(EntityInterface $node, $form) {
   if (_forum_node_check_node_type($node)) {
     $langcode = $form['taxonomy_forums']['#language'];
     // vocabulary is selected, not a "container" term.
@@ -319,7 +318,7 @@ function forum_node_validate(Node $node, $form) {
  *
  * Assigns the forum taxonomy when adding a topic from within a forum.
  */
-function forum_node_presave(Node $node) {
+function forum_node_presave(EntityInterface $node) {
   if (_forum_node_check_node_type($node)) {
     // Make sure all fields are set properly:
     $node->icon = !empty($node->icon) ? $node->icon : '';
@@ -339,7 +338,7 @@ function forum_node_presave(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function forum_node_update(Node $node) {
+function forum_node_update(EntityInterface $node) {
   if (_forum_node_check_node_type($node)) {
     // If this is not a new revision and does exist, update the forum record,
     // otherwise insert a new one.
@@ -389,7 +388,7 @@ function forum_node_update(Node $node) {
 /**
  * Implements hook_node_insert().
  */
-function forum_node_insert(Node $node) {
+function forum_node_insert(EntityInterface $node) {
   if (_forum_node_check_node_type($node)) {
     if (!empty($node->forum_tid)) {
       $nid = db_insert('forum')
@@ -406,7 +405,7 @@ function forum_node_insert(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function forum_node_predelete(Node $node) {
+function forum_node_predelete(EntityInterface $node) {
   if (_forum_node_check_node_type($node)) {
     db_delete('forum')
       ->condition('nid', $node->nid)
@@ -657,7 +656,7 @@ function forum_block_view_pre_render($elements) {
 /**
  * Implements hook_form().
  */
-function forum_form(Node $node, &$form_state) {
+function forum_form(EntityInterface $node, &$form_state) {
   $type = node_type_load($node->type);
   $form['title'] = array(
     '#type' => 'textfield',
diff --git a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
index 5070396..c08ce70 100644
--- a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
+++ b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\forum\Tests;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -540,14 +540,14 @@ function createForumTopic($forum, $container = FALSE) {
    *
    * @param $node_user
    *   The user who creates the node.
-   * @param Drupal\node\Node $node
+   * @param \Drupal\Core\Entity\EntityInterface $node
    *   The node being checked.
    * @param $admin
    *   Boolean to indicate whether the user can 'access administration pages'.
    * @param $response
    *   The exptected HTTP response code.
    */
-  private function verifyForums($node_user, Node $node, $admin, $response = 200) {
+  private function verifyForums($node_user, EntityInterface $node, $admin, $response = 200) {
     $response2 = ($admin) ? 200 : 403;
 
     // View forum help node.
diff --git a/core/modules/history/history.module b/core/modules/history/history.module
index 45027fe..84abade 100644
--- a/core/modules/history/history.module
+++ b/core/modules/history/history.module
@@ -9,7 +9,7 @@
  * - Generic helper for node_mark().
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Entities changed before this time are always shown as read.
@@ -79,7 +79,7 @@ function history_cron() {
 /**
  * Implements hook_node_delete().
  */
-function history_node_delete(Node $node) {
+function history_node_delete(EntityInterface $node) {
   db_delete('history')
     ->condition('nid', $node->nid)
     ->execute();
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleContentTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleContentTest.php
index 67c4eb4..2842cdc 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleContentTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleContentTest.php
@@ -115,7 +115,7 @@ function testContentTypeLanguageConfiguration() {
     $edit = array(
       'type' => $type2->type,
       'title' => $node_title,
-      'body' => array($langcode => array(array('value' => $node_body))),
+      'body' => array(array('value' => $node_body)),
       'langcode' => $langcode,
     );
     $node = $this->drupalCreateNode($edit);
diff --git a/core/modules/menu/menu.module b/core/modules/menu/menu.module
index 44723dd..7b54663 100644
--- a/core/modules/menu/menu.module
+++ b/core/modules/menu/menu.module
@@ -11,7 +11,7 @@
  * URLs to be added to the main site navigation menu.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\block\Plugin\Core\Entity\Block;
 use Drupal\system\Plugin\Core\Entity\Menu;
 use Drupal\system\Plugin\block\block\SystemMenuBlock;
@@ -424,21 +424,21 @@ function menu_block_view_alter(array &$build, Block $block) {
 /**
  * Implements hook_node_insert().
  */
-function menu_node_insert(Node $node) {
+function menu_node_insert(EntityInterface $node) {
   menu_node_save($node);
 }
 
 /**
  * Implements hook_node_update().
  */
-function menu_node_update(Node $node) {
+function menu_node_update(EntityInterface $node) {
   menu_node_save($node);
 }
 
 /**
  * Helper for hook_node_insert() and hook_node_update().
  */
-function menu_node_save(Node $node) {
+function menu_node_save(EntityInterface $node) {
   if (isset($node->menu)) {
     $link = &$node->menu;
     if (empty($link['enabled'])) {
@@ -467,7 +467,7 @@ function menu_node_save(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function menu_node_predelete(Node $node) {
+function menu_node_predelete(EntityInterface $node) {
   // Delete all menu module links that point to this node.
   $query = entity_query('menu_link')
     ->condition('link_path', 'node/' . $node->nid)
@@ -482,7 +482,7 @@ function menu_node_predelete(Node $node) {
 /**
  * Implements hook_node_prepare().
  */
-function menu_node_prepare(Node $node) {
+function menu_node_prepare(EntityInterface $node) {
   if (empty($node->menu)) {
     // Prepare the node for the edit form so that $node->menu always exists.
     $menu_name = strtok(variable_get('menu_parent_' . $node->type, 'main:0'), ':');
@@ -645,7 +645,7 @@ function menu_form_node_form_alter(&$form, $form_state) {
  *
  * @see menu_form_node_form_alter()
  */
-function menu_node_submit(Node $node, $form, $form_state) {
+function menu_node_submit(EntityInterface $node, $form, $form_state) {
   $node->menu = entity_create('menu_link', $form_state['values']['menu']);
   // Decompose the selected menu parent option into 'menu_name' and 'plid', if
   // the form used the default parent selection widget.
diff --git a/core/modules/node/lib/Drupal/node/NodeFormController.php b/core/modules/node/lib/Drupal/node/NodeFormController.php
index 8082322..d868cb0 100644
--- a/core/modules/node/lib/Drupal/node/NodeFormController.php
+++ b/core/modules/node/lib/Drupal/node/NodeFormController.php
@@ -10,12 +10,12 @@
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\Core\Entity\EntityFormController;
+use Drupal\Core\Entity\EntityFormControllerNG;
 
 /**
  * Form controller for the node edit forms.
  */
-class NodeFormController extends EntityFormController {
+class NodeFormController extends EntityFormControllerNG {
 
   /**
    * Prepares the node object.
@@ -471,4 +471,19 @@ public function delete(array $form, array &$form_state) {
     $form_state['redirect'] = array('node/' . $node->nid . '/delete', array('query' => $destination));
   }
 
+  /**
+   * Implements \Drupal\Core\Entity\EntityFormControllerInterface::buildEntity().
+   */
+  public function buildEntity(array $form, array &$form_state) {
+    return parent::buildEntity($form, $form_state)->getBCEntity();
+  }
+
+  /**
+   * Implements \Drupal\Core\Entity\EntityFormControllerInterface::getEntity().
+   */
+  public function getEntity(array $form_state) {
+    $entity = parent::getEntity($form_state);
+    return isset($entity) ? $entity->getBCEntity() : $entity;
+  }
+
 }
diff --git a/core/modules/node/lib/Drupal/node/NodeStorageController.php b/core/modules/node/lib/Drupal/node/NodeStorageController.php
index d855384..5a0a3ae 100644
--- a/core/modules/node/lib/Drupal/node/NodeStorageController.php
+++ b/core/modules/node/lib/Drupal/node/NodeStorageController.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\node;
 
-use Drupal\Core\Entity\DatabaseStorageController;
+use Drupal\Core\Entity\DatabaseStorageControllerNG;
 use Drupal\Core\Entity\EntityInterface;
 
 /**
@@ -16,31 +16,40 @@
  * This extends the Drupal\Core\Entity\DatabaseStorageController class, adding
  * required special handling for node entities.
  */
-class NodeStorageController extends DatabaseStorageController {
+class NodeStorageController extends DatabaseStorageControllerNG {
 
   /**
    * Overrides Drupal\Core\Entity\DatabaseStorageController::create().
    */
   public function create(array $values) {
-    $node = parent::create($values);
-
-    // Set the created time to now.
-    if (empty($node->created)) {
-      $node->created = REQUEST_TIME;
+    // @todo Handle this through property defaults.
+    if (empty($values['created'])) {
+      $values['created'] = REQUEST_TIME;
     }
-
-    return $node;
+    return parent::create($values)->getBCEntity();
   }
 
   /**
-   * Overrides Drupal\Core\Entity\DatabaseStorageController::attachLoad().
+   * Overrides Drupal\Core\Entity\DatabaseStorageControllerNG::attachLoad().
    */
-  protected function attachLoad(&$nodes, $load_revision = FALSE) {
+  protected function attachLoad(&$queried_entities, $load_revision = FALSE) {
+    $nodes = $this->mapFromStorageRecords($queried_entities, $load_revision);
+
     // Create an array of nodes for each content type and pass this to the
-    // object type specific callback.
+    // object type specific callback. To preserve backward-compatibility we
+    // pass on BC decorators to node-specific hooks, while we pass on the
+    // regular entity objects else.
     $typed_nodes = array();
-    foreach ($nodes as $id => $entity) {
-      $typed_nodes[$entity->type][$id] = $entity;
+    foreach ($nodes as $id => $node) {
+      $queried_entities[$id] = $node->getBCEntity();
+      $typed_nodes[$node->bundle()][$id] = $queried_entities[$id];
+    }
+
+    if ($load_revision) {
+      field_attach_load_revision($this->entityType, $queried_entities);
+    }
+    else {
+      field_attach_load($this->entityType, $queried_entities);
     }
 
     // Call object type specific callbacks on each typed array of nodes.
@@ -55,7 +64,19 @@ protected function attachLoad(&$nodes, $load_revision = FALSE) {
     // hook_node_load(), containing a list of node types that were loaded.
     $argument = array_keys($typed_nodes);
     $this->hookLoadArguments = array($argument);
-    parent::attachLoad($nodes, $load_revision);
+
+    // Call hook_entity_load().
+    foreach (module_implements('entity_load') as $module) {
+      $function = $module . '_entity_load';
+      $function($queried_entities, $this->entityType);
+    }
+    // Call hook_TYPE_load(). The first argument for hook_TYPE_load() are
+    // always the queried entities, followed by additional arguments set in
+    // $this->hookLoadArguments.
+    $args = array_merge(array($queried_entities), $this->hookLoadArguments);
+    foreach (module_implements($this->entityType . '_load') as $module) {
+      call_user_func_array($module . '_' . $this->entityType . '_load', $args);
+    }
   }
 
   /**
@@ -77,6 +98,8 @@ protected function buildQuery($ids, $revision_id = FALSE) {
    * Overrides Drupal\Core\Entity\DatabaseStorageController::invokeHook().
    */
   protected function invokeHook($hook, EntityInterface $node) {
+    $node = $node->getBCEntity();
+
     if ($hook == 'insert' || $hook == 'update') {
       node_invoke($node, $hook);
     }
@@ -86,7 +109,23 @@ protected function invokeHook($hook, EntityInterface $node) {
       node_invoke($node, 'delete');
     }
 
-    parent::invokeHook($hook, $node);
+    // Inline parent::invokeHook() to pass on BC-entities to node-specific
+    // hooks.
+
+    $function = 'field_attach_' . $hook;
+    // @todo: field_attach_delete_revision() is named the wrong way round,
+    // consider renaming it.
+    if ($function == 'field_attach_revision_delete') {
+      $function = 'field_attach_delete_revision';
+    }
+    if (!empty($this->entityInfo['fieldable']) && function_exists($function)) {
+      $function($node);
+    }
+
+    // Invoke the hook.
+    module_invoke_all($this->entityType . '_' . $hook, $node);
+    // Invoke the respective entity-level hook.
+    module_invoke_all('entity_' . $hook, $node, $this->entityType);
   }
 
   /**
@@ -94,7 +133,7 @@ protected function invokeHook($hook, EntityInterface $node) {
    */
   protected function preSave(EntityInterface $node) {
     // Before saving the node, set changed and revision times.
-    $node->changed = REQUEST_TIME;
+    $node->changed->value = REQUEST_TIME;
   }
 
   /**
@@ -133,21 +172,22 @@ protected function preSaveRevision(\stdClass $record, EntityInterface $entity) {
   /**
    * Overrides Drupal\Core\Entity\DatabaseStorageController::postSave().
    */
-  function postSave(EntityInterface $node, $update) {
+  public function postSave(EntityInterface $node, $update) {
     // Update the node access table for this node, but only if it is the
     // default revision. There's no need to delete existing records if the node
     // is new.
     if ($node->isDefaultRevision()) {
-      node_access_acquire_grants($node, $update);
+      node_access_acquire_grants($node->getBCEntity(), $update);
     }
   }
+
   /**
    * Overrides Drupal\Core\Entity\DatabaseStorageController::preDelete().
    */
-  function preDelete($entities) {
+  public function preDelete($entities) {
     if (module_exists('search')) {
       foreach ($entities as $id => $entity) {
-        search_reindex($entity->nid, 'node');
+        search_reindex($entity->nid->value, 'node');
       }
     }
   }
@@ -163,4 +203,110 @@ protected function postDelete($nodes) {
       ->condition('nid', $ids, 'IN')
       ->execute();
   }
+
+  /**
+   * Overrides \Drupal\Core\Entity\DataBaseStorageControllerNG::basePropertyDefinitions().
+   */
+  public function baseFieldDefinitions() {
+    $properties['nid'] = array(
+      'label' => t('Node ID'),
+      'description' => t('The node ID.'),
+      'type' => 'integer_field',
+      'read-only' => TRUE,
+    );
+    $properties['uuid'] = array(
+      'label' => t('UUID'),
+      'description' => t('The node UUID.'),
+      'type' => 'string_field',
+      'read-only' => TRUE,
+    );
+    $properties['vid'] = array(
+      'label' => t('Revision ID'),
+      'description' => t('The node revision ID.'),
+      'type' => 'integer_field',
+      'read-only' => TRUE,
+    );
+    $properties['type'] = array(
+      'label' => t('Type'),
+      'description' => t('The node type.'),
+      'type' => 'string_field',
+      'read-only' => TRUE,
+    );
+    $properties['langcode'] = array(
+      'label' => t('Language code'),
+      'description' => t('The node language code.'),
+      'type' => 'language_field',
+    );
+    $properties['title'] = array(
+      'label' => t('Title'),
+      'description' => t('The title of this node, always treated as non-markup plain text.'),
+      'type' => 'string_field',
+    );
+    $properties['uid'] = array(
+      'label' => t('User ID'),
+      'description' => t('The user ID of the node author.'),
+      'type' => 'entity_reference_field',
+      'settings' => array('target_type' => 'user'),
+    );
+    $properties['status'] = array(
+      'label' => t('Publishing status'),
+      'description' => t('A boolean indicating whether the node is published.'),
+      'type' => 'boolean_field',
+    );
+    $properties['created'] = array(
+      'label' => t('Created'),
+      'description' => t('The time that the node was created.'),
+      'type' => 'integer_field',
+    );
+    $properties['changed'] = array(
+      'label' => t('Changed'),
+      'description' => t('The time that the node was last edited.'),
+      'type' => 'integer_field',
+    );
+    $properties['comment'] = array(
+      'label' => t('Comment'),
+      'description' => t('Whether comments are allowed on this node: 0 = no, 1 = closed (read only), 2 = open (read/write).'),
+      'type' => 'integer_field',
+    );
+    $properties['promote'] = array(
+      'label' => t('Promote'),
+      'description' => t('A boolean indicating whether the node should be displayed on the front page.'),
+      'type' => 'boolean_field',
+    );
+    $properties['sticky'] = array(
+      'label' => t('Sticky'),
+      'description' => t('A boolean indicating whether the node should be displayed at the top of lists in which it appears.'),
+      'type' => 'boolean_field',
+    );
+    $properties['tnid'] = array(
+      'label' => t('Translation set ID'),
+      'description' => t('The translation set id for this node, which equals the node id of the source post in each set.'),
+      'type' => 'integer_field',
+    );
+    $properties['translate'] = array(
+      'label' => t('Translate'),
+      'description' => t('A boolean indicating whether this translation page needs to be updated.'),
+      'type' => 'boolean_field',
+    );
+    $properties['revision_timestamp'] = array(
+      'label' => t('Revision timestamp'),
+      'description' => t('The time that the current revision was created.'),
+      'type' => 'integer_field',
+      'queryable' => FALSE,
+    );
+    $properties['revision_uid'] = array(
+      'label' => t('Revision user ID'),
+      'description' => t('The user ID of the author of the current revision.'),
+      'type' => 'entity_reference_field',
+      'settings' => array('target_type' => 'user'),
+      'queryable' => FALSE,
+    );
+    $properties['log'] = array(
+      'label' => t('Log'),
+      'description' => t('The log entry explaining the changes in this version.'),
+      'type' => 'text_field',
+    );
+    return $properties;
+  }
+
 }
diff --git a/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php b/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
index a4cf264..9b8a991 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
@@ -8,7 +8,7 @@
 namespace Drupal\node\Plugin\Core\Entity;
 
 use Drupal\Core\Entity\ContentEntityInterface;
-use Drupal\Core\Entity\Entity;
+use Drupal\Core\Entity\EntityNG;
 use Drupal\Core\Annotation\Plugin;
 use Drupal\Core\Annotation\Translation;
 
@@ -43,7 +43,7 @@
  *   permission_granularity = "bundle"
  * )
  */
-class Node extends Entity implements ContentEntityInterface {
+class Node extends EntityNG implements ContentEntityInterface {
 
   /**
    * The node ID.
@@ -60,16 +60,6 @@ class Node extends Entity implements ContentEntityInterface {
   public $vid;
 
   /**
-   * Indicates whether this is the default node revision.
-   *
-   * The default revision of a node is the one loaded when no specific revision
-   * has been specified. Only default revisions are saved to the node table.
-   *
-   * @var boolean
-   */
-  public $isDefaultRevision = TRUE;
-
-  /**
    * The node UUID.
    *
    * @var string
@@ -88,7 +78,7 @@ class Node extends Entity implements ContentEntityInterface {
    *
    * @var string
    */
-  public $langcode = LANGUAGE_NOT_SPECIFIED;
+  public $langcode;
 
   /**
    * The node title.
@@ -193,33 +183,42 @@ class Node extends Entity implements ContentEntityInterface {
   public $revision_uid;
 
   /**
-   * Implements Drupal\Core\Entity\EntityInterface::id().
-   */
-  public function id() {
-    return $this->nid;
-  }
-
-  /**
-   * Implements Drupal\Core\Entity\EntityInterface::bundle().
-   */
-  public function bundle() {
-    return $this->type;
+   * Overrides \Drupal\Core\Entity\EntityNG::init().
+   */
+  protected function init() {
+    parent::init();
+    // We unset all defined properties, so magic getters apply.
+    unset($this->nid);
+    unset($this->vid);
+    unset($this->uuid);
+    unset($this->type);
+    unset($this->title);
+    unset($this->uid);
+    unset($this->status);
+    unset($this->created);
+    unset($this->changed);
+    unset($this->comment);
+    unset($this->promote);
+    unset($this->sticky);
+    unset($this->tnid);
+    unset($this->translate);
+    unset($this->revision_timestamp);
+    unset($this->revision_uid);
+    unset($this->log);
   }
 
   /**
-   * Overrides Drupal\Core\Entity\Entity::createDuplicate().
+   * Implements Drupal\Core\Entity\EntityInterface::id().
    */
-  public function createDuplicate() {
-    $duplicate = parent::createDuplicate();
-    $duplicate->vid = NULL;
-    return $duplicate;
+  public function id() {
+    return $this->get('nid')->value;
   }
 
   /**
    * Overrides Drupal\Core\Entity\Entity::getRevisionId().
    */
   public function getRevisionId() {
-    return $this->vid;
+    return $this->get('vid')->value;
   }
 
 }
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeAccessFieldTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeAccessFieldTest.php
index 433c6bb..0db0bda 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeAccessFieldTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeAccessFieldTest.php
@@ -57,7 +57,7 @@ function testNodeAccessAdministerField() {
     // Create a page node.
     $langcode = LANGUAGE_NOT_SPECIFIED;
     $field_data = array();
-    $value = $field_data[$langcode][0]['value'] = $this->randomName();
+    $value = $field_data[0]['value'] = $this->randomName();
     $node = $this->drupalCreateNode(array($this->field_name => $field_data));
 
     // Log in as the administrator and confirm that the field value is present.
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php
index 6ff6ae0..efd2b70 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php
@@ -64,7 +64,7 @@ function testNodeAccess() {
 
     // Tests the default access provided for a published Hungarian node.
     $web_user = $this->drupalCreateUser(array('access content'));
-    $node = $this->drupalCreateNode(array('body' => array('hu' => array(array())), 'langcode' => 'hu'));
+    $node = $this->drupalCreateNode(array('body' => array(array()), 'langcode' => 'hu'));
     $this->assertTrue($node->langcode == 'hu', 'Node created as Hungarian.');
     $expected_node_access = array('view' => TRUE, 'update' => FALSE, 'delete' => FALSE);
     $this->assertNodeAccess($expected_node_access, $node, $web_user);
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
index de24f45..a9ae1c3 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
@@ -86,9 +86,7 @@ public function testForumPager() {
         'nid' => NULL,
         'type' => 'forum',
         'taxonomy_forums' => array(
-          LANGUAGE_NOT_SPECIFIED => array(
-            array('tid' => $tid, 'vid' => $vid),
-          ),
+          array('tid' => $tid)
         ),
       ));
     }
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeEntityFieldQueryAlterTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeEntityFieldQueryAlterTest.php
index 2333dd9..9cc80f7 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeEntityFieldQueryAlterTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeEntityFieldQueryAlterTest.php
@@ -50,7 +50,7 @@ function setUp() {
         'value' => 'A' . $this->randomName(32),
         'format' => filter_default_format(),
       );
-      $settings['body'][LANGUAGE_NOT_SPECIFIED][0] = $body;
+      $settings['body'][0] = $body;
       $this->drupalCreateNode($settings);
     }
 
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsAllTestCase.php b/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsAllTestCase.php
index 655c4c1..90a7305 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsAllTestCase.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsAllTestCase.php
@@ -48,18 +48,24 @@ function setUp() {
     $logs = array();
 
     // Get the original node.
-    $nodes[] = $node;
+    $nodes[] = clone $node;
 
     // Create three revisions.
     $revision_count = 3;
     for ($i = 0; $i < $revision_count; $i++) {
-      $logs[] = $settings['log'] = $this->randomName(32);
+      $logs[] = $node->log = $this->randomName(32);
 
       // Create revision with a random title and body and update variables.
-      $this->drupalCreateNode($settings);
-      $node = node_load($node->nid); // Make sure we get revision information.
-      $settings = get_object_vars($node);
-      $nodes[] = $node;
+      $node->title = $this->randomName();
+      $node->body[$node->language()->langcode][0] = array(
+        'value' => $this->randomName(32),
+        'format' => filter_default_format(),
+      );
+      $node->setNewRevision();
+      $node->save();
+
+      $node = node_load($node->nid, TRUE); // Make sure we get revision information.
+      $nodes[] = clone $node;
     }
 
     $this->nodes = $nodes;
@@ -110,7 +116,7 @@ function testRevisions() {
         '%revision-date' => format_date($nodes[1]->revision_timestamp)
       )),
       'Revision reverted.');
-    $reverted_node = node_load($node->nid);
+    $reverted_node = node_load($node->nid, TRUE);
     $this->assertTrue(($nodes[1]->body[LANGUAGE_NOT_SPECIFIED][0]['value'] == $reverted_node->body[LANGUAGE_NOT_SPECIFIED][0]['value']), t('Node reverted correctly.'));
 
     // Confirm that this is not the current version.
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsTest.php
index d5ea7b5..46244b8 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeRevisionsTest.php
@@ -48,20 +48,24 @@ function setUp() {
     $logs = array();
 
     // Get original node.
-    $nodes[] = $node;
+    $nodes[] = clone $node;
 
     // Create three revisions.
     $revision_count = 3;
     for ($i = 0; $i < $revision_count; $i++) {
-      $logs[] = $settings['log'] = $this->randomName(32);
+      $logs[] = $node->log = $this->randomName(32);
 
-      // Create revision with random title and body and update variables.
-      $this->drupalCreateNode($settings);
-      $node = node_load($node->nid); // Make sure we get revision information.
-      $settings = get_object_vars($node);
-      $settings['isDefaultRevision'] = TRUE;
+      // Create revision with a random title and body and update variables.
+      $node->title = $this->randomName();
+      $node->body[$node->language()->langcode][0] = array(
+        'value' => $this->randomName(32),
+        'format' => filter_default_format(),
+      );
+      $node->setNewRevision();
+      $node->save();
 
-      $nodes[] = $node;
+      $node = node_load($node->nid); // Make sure we get revision information.
+      $nodes[] = clone $node;
     }
 
     $this->nodes = $nodes;
@@ -96,7 +100,7 @@ function testRevisions() {
     $this->assertRaw(t('@type %title has been reverted back to the revision from %revision-date.',
                         array('@type' => 'Basic page', '%title' => $nodes[1]->label(),
                               '%revision-date' => format_date($nodes[1]->revision_timestamp))), 'Revision reverted.');
-    $reverted_node = node_load($node->nid);
+    $reverted_node = node_load($node->nid, TRUE);
     $this->assertTrue(($nodes[1]->body[LANGUAGE_NOT_SPECIFIED][0]['value'] == $reverted_node->body[LANGUAGE_NOT_SPECIFIED][0]['value']), 'Node reverted correctly.');
 
     // Confirm that this is not the default version.
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeSaveTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeSaveTest.php
index f86bc52..e2f5f29 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeSaveTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeSaveTest.php
@@ -51,13 +51,13 @@ function testImport() {
     $title = $this->randomName(8);
     $node = array(
       'title' => $title,
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $this->randomName(32)))),
+      'body' => array(array('value' => $this->randomName(32))),
       'uid' => $this->web_user->uid,
       'type' => 'article',
       'nid' => $test_nid,
-      'enforceIsNew' => TRUE,
     );
     $node = node_submit(entity_create('node', $node));
+    $node->enforceIsNew();
 
     // Verify that node_submit did not overwrite the user ID.
     $this->assertEqual($node->uid, $this->web_user->uid, 'Function node_submit() preserves user ID');
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeTokenReplaceTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeTokenReplaceTest.php
index 452f0f4..d17de34 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeTokenReplaceTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeTokenReplaceTest.php
@@ -35,7 +35,7 @@ function testNodeTokenReplacement() {
       'type' => 'article',
       'uid' => $account->uid,
       'title' => '<blink>Blinking Text</blink>',
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $this->randomName(32), 'summary' => $this->randomName(16)))),
+      'body' => array(array('value' => $this->randomName(32), 'summary' => $this->randomName(16))),
     );
     $node = $this->drupalCreateNode($settings);
 
@@ -83,7 +83,7 @@ function testNodeTokenReplacement() {
     }
 
     // Repeat for a node without a summary.
-    $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $this->randomName(32), 'summary' => '')));
+    $settings['body'] = array(array('value' => $this->randomName(32), 'summary' => ''));
     $node = $this->drupalCreateNode($settings);
 
     // Load node (without summary) so that the body and summary fields are
diff --git a/core/modules/node/lib/Drupal/node/Tests/SummaryLengthTest.php b/core/modules/node/lib/Drupal/node/Tests/SummaryLengthTest.php
index ee6ebe5..e627c6e 100644
--- a/core/modules/node/lib/Drupal/node/Tests/SummaryLengthTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/SummaryLengthTest.php
@@ -25,7 +25,7 @@ public static function getInfo() {
   function testSummaryLength() {
     // Create a node to view.
     $settings = array(
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam vitae arcu at leo cursus laoreet. Curabitur dui tortor, adipiscing malesuada tempor in, bibendum ac diam. Cras non tellus a libero pellentesque condimentum. What is a Drupalism? Suspendisse ac lacus libero. Ut non est vel nisl faucibus interdum nec sed leo. Pellentesque sem risus, vulputate eu semper eget, auctor in libero. Ut fermentum est vitae metus convallis scelerisque. Phasellus pellentesque rhoncus tellus, eu dignissim purus posuere id. Quisque eu fringilla ligula. Morbi ullamcorper, lorem et mattis egestas, tortor neque pretium velit, eget eleifend odio turpis eu purus. Donec vitae metus quis leo pretium tincidunt a pulvinar sem. Morbi adipiscing laoreet mauris vel placerat. Nullam elementum, nisl sit amet scelerisque malesuada, dolor nunc hendrerit quam, eu ultrices erat est in orci. Curabitur feugiat egestas nisl sed accumsan.'))),
+      'body' => array(array('value' => 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam vitae arcu at leo cursus laoreet. Curabitur dui tortor, adipiscing malesuada tempor in, bibendum ac diam. Cras non tellus a libero pellentesque condimentum. What is a Drupalism? Suspendisse ac lacus libero. Ut non est vel nisl faucibus interdum nec sed leo. Pellentesque sem risus, vulputate eu semper eget, auctor in libero. Ut fermentum est vitae metus convallis scelerisque. Phasellus pellentesque rhoncus tellus, eu dignissim purus posuere id. Quisque eu fringilla ligula. Morbi ullamcorper, lorem et mattis egestas, tortor neque pretium velit, eget eleifend odio turpis eu purus. Donec vitae metus quis leo pretium tincidunt a pulvinar sem. Morbi adipiscing laoreet mauris vel placerat. Nullam elementum, nisl sit amet scelerisque malesuada, dolor nunc hendrerit quam, eu ultrices erat est in orci. Curabitur feugiat egestas nisl sed accumsan.')),
       'promote' => 1,
     );
     $node = $this->drupalCreateNode($settings);
diff --git a/core/modules/node/node.api.php b/core/modules/node/node.api.php
index 1207238..d5e396c 100644
--- a/core/modules/node/node.api.php
+++ b/core/modules/node/node.api.php
@@ -256,7 +256,7 @@ function hook_node_grants($account, $op) {
  *
  * Note: a deny all grant is not written to the database; denies are implicit.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that has just been saved.
  *
  * @return
@@ -266,7 +266,7 @@ function hook_node_grants($account, $op) {
  * @see hook_node_access_records_alter()
  * @ingroup node_access
  */
-function hook_node_access_records(Drupal\node\Node $node) {
+function hook_node_access_records(\Drupal\Core\Entity\EntityInterface $node) {
   // We only care about the node if it has been marked private. If not, it is
   // treated just like any other node and we completely ignore it.
   if ($node->private) {
@@ -317,7 +317,7 @@ function hook_node_access_records(Drupal\node\Node $node) {
  *
  * @param $grants
  *   The $grants array returned by hook_node_access_records().
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node for which the grants were acquired.
  *
  * The preferred use of this hook is in a module that bridges multiple node
@@ -329,7 +329,7 @@ function hook_node_access_records(Drupal\node\Node $node) {
  * @see hook_node_grants_alter()
  * @ingroup node_access
  */
-function hook_node_access_records_alter(&$grants, Drupal\node\Node $node) {
+function hook_node_access_records_alter(&$grants, Drupal\Core\Entity\EntityInterface $node) {
   // Our module allows editors to mark specific articles with the 'is_preview'
   // field. If the node being saved has a TRUE value for that field, then only
   // our grants are retained, and other grants are removed. Doing so ensures
@@ -459,14 +459,14 @@ function hook_node_operations() {
  * field_attach_delete() are called, and before the node is removed from the
  * node table in the database.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is about to be deleted.
  *
  * @see hook_node_predelete()
  * @see node_delete_multiple()
  * @ingroup node_api_hooks
  */
-function hook_node_predelete(Drupal\node\Node $node) {
+function hook_node_predelete(\Drupal\Core\Entity\EntityInterface $node) {
   db_delete('mytable')
     ->condition('nid', $node->nid)
     ->execute();
@@ -478,14 +478,14 @@ function hook_node_predelete(Drupal\node\Node $node) {
  * This hook is invoked from node_delete_multiple() after field_attach_delete()
  * has been called and after the node has been removed from the database.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that has been deleted.
  *
  * @see hook_node_predelete()
  * @see node_delete_multiple()
  * @ingroup node_api_hooks
  */
-function hook_node_delete(Drupal\node\Node $node) {
+function hook_node_delete(\Drupal\Core\Entity\EntityInterface $node) {
   drupal_set_message(t('Node: @title has been deleted', array('@title' => $node->label())));
 }
 
@@ -496,12 +496,12 @@ function hook_node_delete(Drupal\node\Node $node) {
  * removed from the node_revision table, and before
  * field_attach_delete_revision() is called.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node revision (node object) that is being deleted.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_revision_delete(Drupal\node\Node $node) {
+function hook_node_revision_delete(\Drupal\Core\Entity\EntityInterface $node) {
   db_delete('mytable')
     ->condition('vid', $node->vid)
     ->execute();
@@ -523,12 +523,12 @@ function hook_node_revision_delete(Drupal\node\Node $node) {
  * write/update database queries executed from this hook are also not committed
  * immediately. Check node_save() and db_transaction() for more info.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being created.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_insert(Drupal\node\Node $node) {
+function hook_node_insert(\Drupal\Core\Entity\EntityInterface $node) {
   db_insert('mytable')
     ->fields(array(
       'nid' => $node->nid,
@@ -543,12 +543,12 @@ function hook_node_insert(Drupal\node\Node $node) {
  * This hook runs after a new node object has just been instantiated. It can be
  * used to set initial values, e.g. to provide defaults.
  *
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node object.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_create(\Drupal\node\Plugin\Core\Entity\Node $node) {
+function hook_node_create(\Drupal\Core\Entity\EntityInterface $node) {
   if (!isset($node->foo)) {
     $node->foo = 'some_initial_value';
   }
@@ -615,7 +615,7 @@ function hook_node_load($nodes, $types) {
  * the default home page at path 'node', a recent content block, etc.) See
  * @link node_access Node access rights @endlink for a full explanation.
  *
- * @param Drupal\node\Node|string $node
+ * @param Drupal\Core\Entity\EntityInterface|string $node
  *   Either a node entity or the machine name of the content type on which to
  *   perform the access check.
  * @param string $op
@@ -669,12 +669,12 @@ function hook_node_access($node, $op, $account, $langcode) {
  * This hook is invoked from NodeFormController::prepareEntity() after the
  * type-specific hook_prepare() is invoked.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is about to be shown on the add/edit form.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_prepare(Drupal\node\Node $node) {
+function hook_node_prepare(\Drupal\Core\Entity\EntityInterface $node) {
   if (!isset($node->comment)) {
     $node->comment = variable_get("comment_$node->type", COMMENT_NODE_OPEN);
   }
@@ -686,7 +686,7 @@ function hook_node_prepare(Drupal\node\Node $node) {
  * This hook is invoked from node_search_execute(), after node_load() and
  * node_view() have been called.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being displayed in a search result.
  * @param $langcode
  *   Language code of result being displayed.
@@ -702,7 +702,7 @@ function hook_node_prepare(Drupal\node\Node $node) {
  *
  * @ingroup node_api_hooks
  */
-function hook_node_search_result(Drupal\node\Node $node, $langcode) {
+function hook_node_search_result(\Drupal\Core\Entity\EntityInterface $node, $langcode) {
   $comments = db_query('SELECT comment_count FROM {node_comment_statistics} WHERE nid = :nid', array('nid' => $node->nid))->fetchField();
   return array('comment' => format_plural($comments, '1 comment', '@count comments'));
 }
@@ -713,12 +713,12 @@ function hook_node_search_result(Drupal\node\Node $node, $langcode) {
  * This hook is invoked from node_save() before the node is saved to the
  * database.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being inserted or updated.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_presave(Drupal\node\Node $node) {
+function hook_node_presave(\Drupal\Core\Entity\EntityInterface $node) {
   if ($node->nid && $node->moderate) {
     // Reset votes when node is updated:
     $node->score = 0;
@@ -743,12 +743,12 @@ function hook_node_presave(Drupal\node\Node $node) {
  * write/update database queries executed from this hook are also not committed
  * immediately. Check node_save() and db_transaction() for more info.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being updated.
  *
  * @ingroup node_api_hooks
  */
-function hook_node_update(Drupal\node\Node $node) {
+function hook_node_update(\Drupal\Core\Entity\EntityInterface $node) {
   db_update('mytable')
     ->fields(array('extra' => $node->extra))
     ->condition('nid', $node->nid)
@@ -761,7 +761,7 @@ function hook_node_update(Drupal\node\Node $node) {
  * This hook is invoked during search indexing, after node_load(), and after the
  * result of node_view() is added as $node->rendered to the node object.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being indexed.
  * @param $langcode
  *   Language code of the variant of the node being indexed.
@@ -771,7 +771,7 @@ function hook_node_update(Drupal\node\Node $node) {
  *
  * @ingroup node_api_hooks
  */
-function hook_node_update_index(Drupal\node\Node $node, $langcode) {
+function hook_node_update_index(\Drupal\Core\Entity\EntityInterface $node, $langcode) {
   $text = '';
   $comments = db_query('SELECT subject, comment, format FROM {comment} WHERE nid = :nid AND status = :status', array(':nid' => $node->nid, ':status' => COMMENT_PUBLISHED));
   foreach ($comments as $comment) {
@@ -795,7 +795,7 @@ function hook_node_update_index(Drupal\node\Node $node, $langcode) {
  * hook_node_presave() instead. If it is really necessary to change the node at
  * the validate stage, you can use form_set_value().
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being validated.
  * @param $form
  *   The form being used to edit the node.
@@ -804,7 +804,7 @@ function hook_node_update_index(Drupal\node\Node $node, $langcode) {
  *
  * @ingroup node_api_hooks
  */
-function hook_node_validate(Drupal\node\Node $node, $form, &$form_state) {
+function hook_node_validate(\Drupal\Core\Entity\EntityInterface $node, $form, &$form_state) {
   if (isset($node->end) && isset($node->start)) {
     if ($node->start > $node->end) {
       form_set_error('time', t('An event may not end before it starts.'));
@@ -823,7 +823,7 @@ function hook_node_validate(Drupal\node\Node $node, $form, &$form_state) {
  * properties. See hook_field_attach_extract_form_values() for customizing
  * field-related properties.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity being updated in response to a form submission.
  * @param $form
  *   The form being used to edit the node.
@@ -832,7 +832,7 @@ function hook_node_validate(Drupal\node\Node $node, $form, &$form_state) {
  *
  * @ingroup node_api_hooks
  */
-function hook_node_submit(Drupal\node\Node $node, $form, &$form_state) {
+function hook_node_submit(\Drupal\Core\Entity\EntityInterface $node, $form, &$form_state) {
   // Decompose the selected menu parent option into 'menu_name' and 'plid', if
   // the form used the default parent selection widget.
   if (!empty($form_state['values']['menu']['parent'])) {
@@ -852,7 +852,7 @@ function hook_node_submit(Drupal\node\Node $node, $form, &$form_state) {
  * the RSS item generated for this node.
  * For details on how this is used, see node_feed().
  *
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being assembled for rendering.
  * @param \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display
  *   The entity_display object holding the display options configured for the
@@ -868,7 +868,7 @@ function hook_node_submit(Drupal\node\Node $node, $form, &$form_state) {
  *
  * @ingroup node_api_hooks
  */
-function hook_node_view(\Drupal\node\Plugin\Core\Entity\Node $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display, $view_mode, $langcode) {
+function hook_node_view(\Drupal\Core\Entity\EntityInterface $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display, $view_mode, $langcode) {
   // Only do the extra work if the component is configured to be displayed.
   // This assumes a 'mymodule_addition' extra field has been defined for the
   // node type in hook_field_extra_fields().
@@ -895,7 +895,7 @@ function hook_node_view(\Drupal\node\Plugin\Core\Entity\Node $node, \Drupal\enti
  *
  * @param $build
  *   A renderable array representing the node content.
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being rendered.
  * @param \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display
  *   The entity_display object holding the display options configured for the
@@ -906,7 +906,7 @@ function hook_node_view(\Drupal\node\Plugin\Core\Entity\Node $node, \Drupal\enti
  *
  * @ingroup node_api_hooks
  */
-function hook_node_view_alter(&$build, \Drupal\node\Plugin\Core\Entity\Node $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display) {
+function hook_node_view_alter(&$build, \Drupal\Core\Entity\EntityInterface $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display) {
   if ($build['#view_mode'] == 'full' && isset($build['an_additional_field'])) {
     // Change its weight.
     $build['an_additional_field']['#weight'] = -10;
@@ -1088,12 +1088,12 @@ function hook_node_type_delete($info) {
  * removed from the node table in the database, before hook_node_delete() is
  * invoked, and before field_attach_delete() is called.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being deleted.
  *
  * @ingroup node_api_hooks
  */
-function hook_delete(Drupal\node\Node $node) {
+function hook_delete(\Drupal\Core\Entity\EntityInterface $node) {
   db_delete('mytable')
     ->condition('nid', $node->nid)
     ->execute();
@@ -1108,12 +1108,12 @@ function hook_delete(Drupal\node\Node $node) {
  * This hook is invoked from NodeFormController::prepareEntity() before the
  * general hook_node_prepare() is invoked.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is about to be shown on the add/edit form.
  *
  * @ingroup node_api_hooks
  */
-function hook_prepare(Drupal\node\Node $node) {
+function hook_prepare(\Drupal\Core\Entity\EntityInterface $node) {
   if ($file = file_check_upload($field_name)) {
     $file = file_save_upload($field_name, _image_filename($file->filename, NULL, TRUE));
     if ($file) {
@@ -1144,7 +1144,7 @@ function hook_prepare(Drupal\node\Node $node) {
  * displayed automatically by the node module. This hook just needs to
  * return the node title and form editing fields specific to the node type.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being added or edited.
  * @param $form_state
  *   The form state array.
@@ -1155,7 +1155,7 @@ function hook_prepare(Drupal\node\Node $node) {
  *
  * @ingroup node_api_hooks
  */
-function hook_form(Drupal\node\Node $node, &$form_state) {
+function hook_form(\Drupal\Core\Entity\EntityInterface $node, &$form_state) {
   $type = node_type_load($node->type);
 
   $form['title'] = array(
@@ -1196,12 +1196,12 @@ function hook_form(Drupal\node\Node $node, &$form_state) {
  * node table in the database, before field_attach_insert() is called, and
  * before hook_node_insert() is invoked.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being created.
  *
  * @ingroup node_api_hooks
  */
-function hook_insert(Drupal\node\Node $node) {
+function hook_insert(\Drupal\Core\Entity\EntityInterface $node) {
   db_insert('mytable')
     ->fields(array(
       'nid' => $node->nid,
@@ -1255,12 +1255,12 @@ function hook_load($nodes) {
  * node table in the database, before field_attach_update() is called, and
  * before hook_node_update() is invoked.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node that is being updated.
  *
  * @ingroup node_api_hooks
  */
-function hook_update(Drupal\node\Node $node) {
+function hook_update(\Drupal\Core\Entity\EntityInterface $node) {
   db_update('mytable')
     ->fields(array('extra' => $node->extra))
     ->condition('nid', $node->nid)
@@ -1284,7 +1284,7 @@ function hook_update(Drupal\node\Node $node) {
  * have no effect.  The preferred method to change a node's content is to use
  * hook_node_presave() instead.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node being validated.
  * @param $form
  *   The form being used to edit the node.
@@ -1293,7 +1293,7 @@ function hook_update(Drupal\node\Node $node) {
  *
  * @ingroup node_api_hooks
  */
-function hook_validate(Drupal\node\Node $node, $form, &$form_state) {
+function hook_validate(\Drupal\Core\Entity\EntityInterface $node, $form, &$form_state) {
   if (isset($node->end) && isset($node->start)) {
     if ($node->start > $node->end) {
       form_set_error('time', t('An event may not end before it starts.'));
@@ -1311,7 +1311,7 @@ function hook_validate(Drupal\node\Node $node, $form, &$form_state) {
  * that the node type module can define a custom method for display, or add to
  * the default display.
  *
- * @param \Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to be displayed, as returned by node_load().
  * @param \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display
  *   The entity_display object holding the display options configured for the
@@ -1332,7 +1332,7 @@ function hook_validate(Drupal\node\Node $node, $form, &$form_state) {
  *
  * @ingroup node_api_hooks
  */
-function hook_view(\Drupal\node\Plugin\Core\Entity\Node $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display, $view_mode) {
+function hook_view(\Drupal\Core\Entity\EntityInterface $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display, $view_mode) {
   if ($view_mode == 'full' && node_is_page($node)) {
     $breadcrumb = array();
     $breadcrumb[] = l(t('Home'), NULL);
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index ff073ae..faf2a65 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -15,11 +15,10 @@
 use Drupal\Core\Database\Query\SelectExtender;
 use Drupal\Core\Database\Query\SelectInterface;
 use Drupal\Core\Datetime\DrupalDateTime;
-use Drupal\Core\Template\Attribute;
-use Drupal\node\Plugin\Core\Entity\Node;
-use Drupal\file\Plugin\Core\Entity\File;
 use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Template\Attribute;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
+use Drupal\file\Plugin\Core\Entity\File;
 
 /**
  * Denotes that the node is not published.
@@ -250,15 +249,15 @@ function node_entity_display_alter(EntityDisplay $display, $context) {
 /**
  * Entity URI callback.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  *
  * @return array
  *   An array with 'path' as the key and the path to the node as its value.
  */
-function node_uri(Node $node) {
+function node_uri(EntityInterface $node) {
   return array(
-    'path' => 'node/' . $node->nid,
+    'path' => 'node/' . $node->nid->value,
   );
 }
 
@@ -407,7 +406,7 @@ function node_type_get_label($name) {
 /**
  * Returns the node type label for the passed node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity to return the node type's label for.
  *
  * @return string|false
@@ -907,7 +906,7 @@ function node_hook($type, $hook) {
 /**
  * Invokes a node hook.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A Node entity.
  * @param $hook
  *   A string containing the name of the hook.
@@ -944,7 +943,12 @@ function node_invoke($node, $hook, $a2 = NULL, $a3 = NULL, $a4 = NULL) {
  * @see Drupal\Core\Entity\Query\EntityQueryInterface
  */
 function node_load_multiple(array $nids = NULL, $reset = FALSE) {
-  return entity_load_multiple('node', $nids, $reset);
+  $entities = entity_load_multiple('node', $nids, $reset);
+  // Return BC-entities.
+  foreach ($entities as $id => $entity) {
+    $entities[$id] = $entity->getBCEntity();
+  }
+  return $entities;
 }
 
 /**
@@ -960,7 +964,8 @@ function node_load_multiple(array $nids = NULL, $reset = FALSE) {
  *   A fully-populated node entity, or FALSE if the node is not found.
  */
 function node_load($nid = NULL, $reset = FALSE) {
-  return entity_load('node', $nid, $reset);
+  $entity = entity_load('node', $nid, $reset);
+  return $entity ? $entity->getBCEntity() : FALSE;
 }
 
 /**
@@ -979,13 +984,13 @@ function node_revision_load($vid = NULL) {
 /**
  * Prepares a node for saving by populating the author and creation date.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node object.
  *
  * @return Drupal\node\Node
  *   An updated node object.
  */
-function node_submit(Node $node) {
+function node_submit(EntityInterface $node) {
   global $user;
 
   // A user might assign the node author by entering a user name in the node
@@ -1020,11 +1025,11 @@ function node_submit(Node $node) {
 /**
  * Saves changes to a node or adds a new node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The $node entity to be saved. If $node->nid is
  *   omitted (or $node->is_new is TRUE), a new node will be added.
  */
-function node_save(Node $node) {
+function node_save(EntityInterface $node) {
   $node->save();
 }
 
@@ -1067,7 +1072,7 @@ function node_revision_delete($revision_id) {
 /**
  * Page callback: Generates an array which displays a node detail page.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $message
  *   (optional) A flag which sets a page title relevant to the revision being
@@ -1078,7 +1083,7 @@ function node_revision_delete($revision_id) {
  *
  * @see node_menu()
  */
-function node_show(Node $node, $message = FALSE) {
+function node_show(EntityInterface $node, $message = FALSE) {
   if ($message) {
     drupal_set_title(t('Revision of %title from %date', array('%title' => $node->label(), '%date' => format_date($node->revision_timestamp))), PASS_THROUGH);
   }
@@ -1097,13 +1102,13 @@ function node_show(Node $node, $message = FALSE) {
 /**
  * Checks whether the current page is the full page view of the passed-in node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  *
  * @return
  *   The ID of the node if this is a full page view, otherwise FALSE.
  */
-function node_is_page(Node $node) {
+function node_is_page(EntityInterface $node) {
   $page_node = menu_get_object();
   return (!empty($page_node) ? $page_node->nid == $node->nid : FALSE);
 }
@@ -1411,7 +1416,7 @@ function node_search_execute($keys = NULL, $conditions = NULL) {
       'type' => check_plain(node_get_type_label($node)),
       'title' => $node->label($item->langcode),
       'user' => theme('username', array('account' => $node)),
-      'date' => $node->get('changed', $item->langcode),
+      'date' => $node->getTranslation($item->langcode)->changed->value,
       'node' => $node,
       'extra' => $extra,
       'score' => $item->calculated_score,
@@ -1542,7 +1547,7 @@ function theme_node_search_admin($variables) {
 /**
  * Access callback: Checks node revision access.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to check.
  * @param $op
  *   (optional) The specific operation being checked. Defaults to 'view.'
@@ -1560,7 +1565,7 @@ function theme_node_search_admin($variables) {
  *
  * @see node_menu()
  */
-function _node_revision_access(Node $node, $op = 'view', $account = NULL, $langcode = NULL) {
+function _node_revision_access(EntityInterface $node, $op = 'view', $account = NULL, $langcode = NULL) {
   $access = &drupal_static(__FUNCTION__, array());
 
   $map = array(
@@ -1854,7 +1859,7 @@ function node_type_page_title($type) {
 /**
  * Title callback: Displays the node's title.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity.
  *
  * @return
@@ -1862,7 +1867,7 @@ function node_type_page_title($type) {
  *
  * @see node_menu()
  */
-function node_page_title(Node $node) {
+function node_page_title(EntityInterface $node) {
   return $node->label();
 }
 
@@ -1882,13 +1887,13 @@ function node_last_changed($nid) {
 /**
  * Returns a list of all the existing revision numbers for the node passed in.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity.
  *
  * @return
  *   An associative array keyed by node revision number.
  */
-function node_revision_list(Node $node) {
+function node_revision_list(EntityInterface $node) {
   $revisions = array();
   $result = db_query('SELECT r.vid, r.title, r.log, r.uid, n.vid AS current_vid, r.timestamp, u.name FROM {node_revision} r LEFT JOIN {node} n ON n.vid = r.vid INNER JOIN {users} u ON u.uid = r.uid WHERE r.nid = :nid ORDER BY r.vid DESC', array(':nid' => $node->nid));
   foreach ($result as $revision) {
@@ -2163,7 +2168,7 @@ function node_feed($nids = FALSE, $channel = array()) {
 /**
  * Generates an array for rendering the given node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $view_mode
  *   (optional) View mode, e.g., 'full', 'teaser'... Defaults to 'full.'
@@ -2174,7 +2179,7 @@ function node_feed($nids = FALSE, $channel = array()) {
  * @return
  *   An array as expected by drupal_render().
  */
-function node_view(Node $node, $view_mode = 'full', $langcode = NULL) {
+function node_view(EntityInterface $node, $view_mode = 'full', $langcode = NULL) {
   return entity_view($node, $view_mode, $langcode);
 }
 
@@ -2255,7 +2260,7 @@ function node_page_default() {
 /**
  * Page callback: Displays a single node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity.
  *
  * @return
@@ -2263,7 +2268,7 @@ function node_page_default() {
  *
  * @see node_menu()
  */
-function node_page_view(Node $node) {
+function node_page_view(EntityInterface $node) {
   // If there is a menu link to this node, the link becomes the last part
   // of the active trail, and the link name becomes the page title.
   // Thus, we must explicitly set the page title to be the node title.
@@ -2304,10 +2309,10 @@ function node_update_index() {
 /**
  * Indexes a single node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to index.
  */
-function _node_index_node(Node $node) {
+function _node_index_node(EntityInterface $node) {
 
   // Save the changed time of the most recent indexed node, for the search
   // results half-life calculation.
@@ -2563,7 +2568,7 @@ function node_form_system_themes_admin_form_submit($form, &$form_state) {
  *   - "update"
  *   - "delete"
  *   - "create"
- * @param Drupal\node\Node|string|stdClass $node
+ * @param Drupal\Core\Entity\EntityInterface|string|stdClass $node
  *   The node entity on which the operation is to be performed, or the node type
  *   object, or node type string (e.g., 'forum') for the 'create' operation.
  * @param $account
@@ -2639,7 +2644,7 @@ function node_access($op, $node, $account = NULL, $langcode = NULL) {
   }
 
   // Check if authors can view their own unpublished nodes.
-  if ($op == 'view' && !$node->get('status', $langcode) && user_access('view own unpublished content', $account) && $account->uid == $node->get('uid', $langcode) && $account->uid != 0) {
+  if ($op == 'view' && empty($node->get('status', $langcode)->value) && user_access('view own unpublished content', $account) && $account->uid == $node->get('uid', $langcode)->value && $account->uid != 0) {
     $rights[$account->uid][$cid][$langcode][$op] = TRUE;
     return TRUE;
   }
@@ -2676,7 +2681,7 @@ function node_access($op, $node, $account = NULL, $langcode = NULL) {
       $rights[$account->uid][$cid][$langcode][$op] = $result;
       return $result;
     }
-    elseif (is_object($node) && $op == 'view' && $node->get('status', $langcode)) {
+    elseif (is_object($node) && $op == 'view' && !empty($node->get('status', $langcode)->value)) {
       // If no modules implement hook_node_grants(), the default behavior is to
       // allow all users to view published nodes, so reflect that here.
       $rights[$account->uid][$cid][$langcode][$op] = TRUE;
@@ -2990,13 +2995,13 @@ function node_query_node_access_alter(AlterableInterface $query) {
  * via hook_node_access_records_alter() implementations, and saves the collected
  * and altered grants to the database.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The $node to acquire grants for.
  * @param $delete
  *   (optional) Whether to delete existing node access records before inserting
  *   new ones. Defaults to TRUE.
  */
-function node_access_acquire_grants(Node $node, $delete = TRUE) {
+function node_access_acquire_grants(EntityInterface $node, $delete = TRUE) {
   $grants = module_invoke_all('node_access_records', $node);
   // Let modules alter the grants.
   drupal_alter('node_access_records', $grants, $node);
@@ -3018,7 +3023,7 @@ function node_access_acquire_grants(Node $node, $delete = TRUE) {
  * Note: Don't call this function directly from a contributed module. Call
  * node_access_acquire_grants() instead.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node whose grants are being written.
  * @param $grants
  *   A list of grants to write. Each grant is an array that must contain the
@@ -3036,7 +3041,7 @@ function node_access_acquire_grants(Node $node, $delete = TRUE) {
  *
  * @see node_access_acquire_grants()
  */
-function _node_access_write_grants(Node $node, $grants, $realm = NULL, $delete = TRUE) {
+function _node_access_write_grants(EntityInterface $node, $grants, $realm = NULL, $delete = TRUE) {
   if ($delete) {
     $query = db_delete('node_access')->condition('nid', $node->nid);
     if ($realm) {
@@ -3239,7 +3244,7 @@ function _node_access_rebuild_batch_finished($success, $results, $operations) {
 /**
  * Implements hook_form().
  */
-function node_content_form(Node $node, $form_state) {
+function node_content_form(EntityInterface $node, $form_state) {
   // @todo It is impossible to define a content type without implementing
   //   hook_form(). Remove this requirement.
   $form = array();
@@ -3335,7 +3340,7 @@ function node_action_info() {
 /**
  * Sets the status of a node to 1 (published).
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3343,7 +3348,7 @@ function node_action_info() {
  *
  * @ingroup actions
  */
-function node_publish_action(Node $node, $context = array()) {
+function node_publish_action(EntityInterface $node, $context = array()) {
   $node->status = NODE_PUBLISHED;
   watchdog('action', 'Set @type %title to published.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3351,7 +3356,7 @@ function node_publish_action(Node $node, $context = array()) {
 /**
  * Sets the status of a node to 0 (unpublished).
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3359,7 +3364,7 @@ function node_publish_action(Node $node, $context = array()) {
  *
  * @ingroup actions
  */
-function node_unpublish_action(Node $node, $context = array()) {
+function node_unpublish_action(EntityInterface $node, $context = array()) {
   $node->status = NODE_NOT_PUBLISHED;
   watchdog('action', 'Set @type %title to unpublished.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3367,7 +3372,7 @@ function node_unpublish_action(Node $node, $context = array()) {
 /**
  * Sets the sticky-at-top-of-list property of a node to 1.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3375,7 +3380,7 @@ function node_unpublish_action(Node $node, $context = array()) {
  *
  * @ingroup actions
  */
-function node_make_sticky_action(Node $node, $context = array()) {
+function node_make_sticky_action(EntityInterface $node, $context = array()) {
   $node->sticky = NODE_STICKY;
   watchdog('action', 'Set @type %title to sticky.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3383,7 +3388,7 @@ function node_make_sticky_action(Node $node, $context = array()) {
 /**
  * Sets the sticky-at-top-of-list property of a node to 0.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3391,7 +3396,7 @@ function node_make_sticky_action(Node $node, $context = array()) {
  *
  * @ingroup actions
  */
-function node_make_unsticky_action(Node $node, $context = array()) {
+function node_make_unsticky_action(EntityInterface $node, $context = array()) {
   $node->sticky = NODE_NOT_STICKY;
   watchdog('action', 'Set @type %title to unsticky.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3399,7 +3404,7 @@ function node_make_unsticky_action(Node $node, $context = array()) {
 /**
  * Sets the promote property of a node to 1.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3407,7 +3412,7 @@ function node_make_unsticky_action(Node $node, $context = array()) {
  *
  * @ingroup actions
  */
-function node_promote_action(Node $node, $context = array()) {
+function node_promote_action(EntityInterface $node, $context = array()) {
   $node->promote = NODE_PROMOTED;
   watchdog('action', 'Promoted @type %title to front page.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3415,7 +3420,7 @@ function node_promote_action(Node $node, $context = array()) {
 /**
  * Sets the promote property of a node to 0.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  * @param $context
  *   (optional) Array of additional information about what triggered the action.
@@ -3423,7 +3428,7 @@ function node_promote_action(Node $node, $context = array()) {
  *
  * @ingroup actions
  */
-function node_unpromote_action(Node $node, $context = array()) {
+function node_unpromote_action(EntityInterface $node, $context = array()) {
   $node->promote = NODE_NOT_PROMOTED;
   watchdog('action', 'Removed @type %title from front page.', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3431,12 +3436,12 @@ function node_unpromote_action(Node $node, $context = array()) {
 /**
  * Saves a node.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to be saved.
  *
  * @ingroup actions
  */
-function node_save_action(Node $node) {
+function node_save_action(EntityInterface $node) {
   $node->save();
   watchdog('action', 'Saved @type %title', array('@type' => node_get_type_label($node), '%title' => $node->label()));
 }
@@ -3444,7 +3449,7 @@ function node_save_action(Node $node) {
 /**
  * Assigns ownership of a node to a user.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity to modify.
  * @param $context
  *   Array of additional information about what triggered the action. Includes
@@ -3456,7 +3461,7 @@ function node_save_action(Node $node) {
  * @see node_assign_owner_action_submit()
  * @ingroup actions
  */
-function node_assign_owner_action(Node $node, $context) {
+function node_assign_owner_action(EntityInterface $node, $context) {
   $node->uid = $context['owner_uid'];
   $owner_name = db_query("SELECT name FROM {users} WHERE uid = :uid", array(':uid' => $context['owner_uid']))->fetchField();
   watchdog('action', 'Changed owner of @type %title to uid %name.', array('@type' =>  node_get_type_label($node), '%title' => $node->label(), '%name' => $owner_name));
@@ -3565,7 +3570,7 @@ function node_unpublish_by_keyword_action_submit($form, $form_state) {
 /**
  * Unpublishes a node containing certain keywords.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity to modify.
  * @param $context
  *   Array of additional information about what triggered the action. Includes
@@ -3578,7 +3583,7 @@ function node_unpublish_by_keyword_action_submit($form, $form_state) {
  *
  * @ingroup actions
  */
-function node_unpublish_by_keyword_action(Node $node, $context) {
+function node_unpublish_by_keyword_action(EntityInterface $node, $context) {
   foreach ($context['keywords'] as $keyword) {
     $elements = node_view(clone $node);
     if (strpos(drupal_render($elements), $keyword) !== FALSE || strpos($node->label(), $keyword) !== FALSE) {
diff --git a/core/modules/node/node.pages.inc b/core/modules/node/node.pages.inc
index 245fef7..cfbf715 100644
--- a/core/modules/node/node.pages.inc
+++ b/core/modules/node/node.pages.inc
@@ -9,7 +9,7 @@
  * @see node_menu()
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Page callback: Presents the node editing form.
@@ -106,7 +106,7 @@ function node_add($node_type) {
     'name' => (isset($user->name) ? $user->name : ''),
     'type' => $type,
     'langcode' => $langcode ? $langcode : language_default()->langcode,
-  ));
+  ))->getBCEntity();
   drupal_set_title(t('Create @name', array('@name' => $node_type->name)), PASS_THROUGH);
   $output = entity_get_form($node);
 
@@ -116,7 +116,7 @@ function node_add($node_type) {
 /**
  * Generates a node preview.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node to preview.
  *
  * @return
@@ -124,7 +124,7 @@ function node_add($node_type) {
  *
  * @see node_form_build_preview()
  */
-function node_preview(Node $node) {
+function node_preview(EntityInterface $node) {
   if (node_access('create', $node) || node_access('update', $node)) {
     _field_invoke_multiple('load', 'node', array($node->nid => $node));
     // Load the user's name when needed.
diff --git a/core/modules/node/tests/modules/node_access_test/node_access_test.module b/core/modules/node/tests/modules/node_access_test/node_access_test.module
index 4efee88..deaf9bb 100644
--- a/core/modules/node/tests/modules/node_access_test/node_access_test.module
+++ b/core/modules/node/tests/modules/node_access_test/node_access_test.module
@@ -9,7 +9,7 @@
  * a special 'node test view' permission.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Implements hook_node_grants().
@@ -32,7 +32,7 @@ function node_access_test_node_grants($account, $op) {
 /**
  * Implements hook_node_access_records().
  */
-function node_access_test_node_access_records(Node $node) {
+function node_access_test_node_access_records(EntityInterface $node) {
   $grants = array();
   // For NodeAccessBaseTableTestCase, only set records for private nodes.
   if (!state()->get('node_access_test.private') || $node->private) {
@@ -207,28 +207,28 @@ function node_access_test_node_load($nodes, $types) {
  * Implements hook_node_predelete().
  */
 
-function node_access_test_node_predelete(Node $node) {
+function node_access_test_node_predelete(EntityInterface $node) {
   db_delete('node_access_test')->condition('nid', $node->nid)->execute();
 }
 
 /**
  * Implements hook_node_insert().
  */
-function node_access_test_node_insert(Node $node) {
+function node_access_test_node_insert(EntityInterface $node) {
   _node_access_test_node_write($node);
 }
 
 /**
  * Implements hook_nodeapi_update().
  */
-function node_access_test_node_update(Node $node) {
+function node_access_test_node_update(EntityInterface $node) {
   _node_access_test_node_write($node);
 }
 
 /**
  * Helper for node insert/update.
  */
-function _node_access_test_node_write(Node $node) {
+function _node_access_test_node_write(EntityInterface $node) {
   if (isset($node->private)) {
     db_merge('node_access_test')
       ->key(array('nid' => $node->nid))
diff --git a/core/modules/node/tests/modules/node_test/node_test.module b/core/modules/node/tests/modules/node_test/node_test.module
index 36b59c9..467af62 100644
--- a/core/modules/node/tests/modules/node_test/node_test.module
+++ b/core/modules/node/tests/modules/node_test/node_test.module
@@ -8,7 +8,7 @@
  * interaction with the Node module.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 
 /**
@@ -30,7 +30,7 @@ function node_test_node_load($nodes, $types) {
 /**
  * Implements hook_node_view().
  */
-function node_test_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function node_test_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   if ($view_mode == 'rss') {
     // Add RSS elements and namespaces when building the RSS feed.
     $node->rss_elements[] = array(
@@ -71,7 +71,7 @@ function node_test_node_grants($account, $op) {
 /**
  * Implements hook_node_access_records().
  */
-function node_test_node_access_records(Node $node) {
+function node_test_node_access_records(EntityInterface $node) {
   // Return nothing when testing for empty responses.
   if (!empty($node->disable_node_access)) {
     return;
@@ -105,7 +105,7 @@ function node_test_node_access_records(Node $node) {
 /**
  * Implements hook_node_access_records_alter().
  */
-function node_test_node_access_records_alter(&$grants, Node $node) {
+function node_test_node_access_records_alter(&$grants, EntityInterface $node) {
   if (!empty($grants)) {
     foreach ($grants as $key => $grant) {
       // Alter grant from test_page_realm to test_alter_realm and modify the gid.
@@ -128,7 +128,7 @@ function node_test_node_grants_alter(&$grants, $account, $op) {
 /**
  * Implements hook_node_presave().
  */
-function node_test_node_presave(Node $node) {
+function node_test_node_presave(EntityInterface $node) {
   if ($node->title == 'testing_node_presave') {
     // Sun, 19 Nov 1978 05:00:00 GMT
     $node->created = 280299600;
@@ -146,7 +146,7 @@ function node_test_node_presave(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function node_test_node_update(Node $node) {
+function node_test_node_update(EntityInterface $node) {
   // Determine changes on update.
   if (!empty($node->original) && $node->original->title == 'test_changes') {
     if ($node->original->title != $node->title) {
@@ -172,7 +172,7 @@ function node_test_entity_view_mode_alter(&$view_mode, Drupal\Core\Entity\Entity
  *
  * @see \Drupal\node\Tests\NodeSaveTest::testNodeSaveOnInsert()
  */
-function node_test_node_insert(Node $node) {
+function node_test_node_insert(EntityInterface $node) {
   // Set the node title to the node ID and save.
   if ($node->title == 'new') {
     $node->title = 'Node '. $node->nid;
diff --git a/core/modules/node/tests/modules/node_test_exception/node_test_exception.module b/core/modules/node/tests/modules/node_test_exception/node_test_exception.module
index 359af1f..9eaa4f1 100644
--- a/core/modules/node/tests/modules/node_test_exception/node_test_exception.module
+++ b/core/modules/node/tests/modules/node_test_exception/node_test_exception.module
@@ -5,12 +5,12 @@
  * A module implementing node related hooks to test API interaction.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Implements hook_node_insert().
  */
-function node_test_exception_node_insert(Node $node) {
+function node_test_exception_node_insert(EntityInterface $node) {
   if ($node->title == 'testing_transaction_exception') {
     throw new Exception('Test exception for rollback.');
   }
diff --git a/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php b/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
index 3409185..5f6fcc1 100644
--- a/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
+++ b/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
@@ -70,7 +70,7 @@ function testOptionsAllowedValuesInteger() {
     // Create a node with actual data for the field.
     $settings = array(
       'type' => $this->type,
-      $this->field_name => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 1))),
+      $this->field_name =>array(array('value' => 1)),
     );
     $node = $this->drupalCreateNode($settings);
 
@@ -120,7 +120,7 @@ function testOptionsAllowedValuesFloat() {
     // Create a node with actual data for the field.
     $settings = array(
       'type' => $this->type,
-      $this->field_name => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => .5))),
+      $this->field_name => array(array('value' => .5)),
     );
     $node = $this->drupalCreateNode($settings);
 
@@ -172,7 +172,7 @@ function testOptionsAllowedValuesText() {
     // Create a node with actual data for the field.
     $settings = array(
       'type' => $this->type,
-      $this->field_name => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'One'))),
+      $this->field_name => array(array('value' => 'One')),
     );
     $node = $this->drupalCreateNode($settings);
 
diff --git a/core/modules/path/path.module b/core/modules/path/path.module
index 7d3fadd..d58ef1a 100644
--- a/core/modules/path/path.module
+++ b/core/modules/path/path.module
@@ -5,7 +5,7 @@
  * Enables users to rename URLs.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 use Drupal\taxonomy\Plugin\Core\Entity\Term;
 
@@ -187,7 +187,7 @@ function path_form_element_validate($element, &$form_state, $complete_form) {
 /**
  * Implements hook_node_insert().
  */
-function path_node_insert(Node $node) {
+function path_node_insert(EntityInterface $node) {
   if (isset($node->path)) {
     $alias = trim($node->path['alias']);
     // Only save a non-empty alias.
@@ -203,7 +203,7 @@ function path_node_insert(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function path_node_update(Node $node) {
+function path_node_update(EntityInterface $node) {
   if (isset($node->path)) {
     $path = $node->path;
     $alias = trim($path['alias']);
@@ -224,7 +224,7 @@ function path_node_update(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function path_node_predelete(Node $node) {
+function path_node_predelete(EntityInterface $node) {
   // Delete all aliases associated with this node.
   drupal_container()->get('path.crud')->delete(array('source' => 'node/' . $node->nid));
 }
diff --git a/core/modules/php/lib/Drupal/php/Tests/PhpTestBase.php b/core/modules/php/lib/Drupal/php/Tests/PhpTestBase.php
index 596ebd8..abb3412 100644
--- a/core/modules/php/lib/Drupal/php/Tests/PhpTestBase.php
+++ b/core/modules/php/lib/Drupal/php/Tests/PhpTestBase.php
@@ -58,6 +58,6 @@ function setUp() {
    * @return stdObject Node object.
    */
   function createNodeWithCode() {
-    return $this->drupalCreateNode(array('body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => '<?php print "SimpleTest PHP was executed!"; ?>')))));
+    return $this->drupalCreateNode(array('body' => array(array('value' => '<?php print "SimpleTest PHP was executed!"; ?>'))));
   }
 }
diff --git a/core/modules/rdf/lib/Drupal/rdf/Tests/TrackerAttributesTest.php b/core/modules/rdf/lib/Drupal/rdf/Tests/TrackerAttributesTest.php
index 45488bd..c413d86 100644
--- a/core/modules/rdf/lib/Drupal/rdf/Tests/TrackerAttributesTest.php
+++ b/core/modules/rdf/lib/Drupal/rdf/Tests/TrackerAttributesTest.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\rdf\Tests;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -71,10 +71,10 @@ function testAttributesInTracker() {
    *
    * Tests the tracker page for RDFa markup.
    *
-   * @param Node $node
+   * @param EntityInterface $node
    * The node just created.
    */
-  function _testBasicTrackerRdfaMarkup(Node $node) {
+  function _testBasicTrackerRdfaMarkup(EntityInterface $node) {
     $node_uri = url('node/' . $node->nid, array('absolute' => TRUE));
     $user_uri = url('user/' . $node->uid, array('absolute' => TRUE));
 
diff --git a/core/modules/rest/lib/Drupal/rest/Tests/RESTTestBase.php b/core/modules/rest/lib/Drupal/rest/Tests/RESTTestBase.php
index f7dbdb6..b5f54d8 100644
--- a/core/modules/rest/lib/Drupal/rest/Tests/RESTTestBase.php
+++ b/core/modules/rest/lib/Drupal/rest/Tests/RESTTestBase.php
@@ -142,7 +142,7 @@ protected function entityValues($entity_type) {
           'field_test_text' => array(0 => array('value' => $this->randomString())),
         );
       case 'node':
-        return array('title' => $this->randomString());
+        return array('title' => $this->randomString(), 'type' => $this->randomString());
       case 'user':
         return array('name' => $this->randomName());
       default:
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchCommentTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchCommentTest.php
index d6c25b1..72771a3 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchCommentTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchCommentTest.php
@@ -221,7 +221,7 @@ function testAddNewComment() {
     $settings = array(
       'type' => 'article',
       'title' => 'short title',
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'short body text'))),
+      'body' => array(array('value' => 'short body text')),
     );
 
     $user = $this->drupalCreateUser(array('search content', 'create article content', 'access content'));
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchExactTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchExactTest.php
index 7d3ba42..c52549f 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchExactTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchExactTest.php
@@ -32,12 +32,12 @@ function testExactQuery() {
     );
     // Create nodes with exact phrase.
     for ($i = 0; $i <= 17; $i++) {
-      $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'love pizza')));
+      $settings['body'] = array(array('value' => 'love pizza'));
       $this->drupalCreateNode($settings);
     }
     // Create nodes containing keywords.
     for ($i = 0; $i <= 17; $i++) {
-      $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'love cheesy pizza')));
+      $settings['body'] = array(array('value' => 'love cheesy pizza'));
       $this->drupalCreateNode($settings);
     }
 
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchNodeAccessTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchNodeAccessTest.php
index 19c94cb..67706cf 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchNodeAccessTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchNodeAccessTest.php
@@ -42,7 +42,7 @@ function setUp() {
    * Tests that search returns results with punctuation in the search phrase.
    */
   function testPhraseSearchPunctuation() {
-    $node = $this->drupalCreateNode(array('body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => "The bunny's ears were fluffy.")))));
+    $node = $this->drupalCreateNode(array('body' => array(array('value' => "The bunny's ears were fluffy."))));
 
     // Update the search index.
     module_invoke_all('update_index');
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchNumberMatchingTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchNumberMatchingTest.php
index 540526b..1e3bf78 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchNumberMatchingTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchNumberMatchingTest.php
@@ -45,7 +45,7 @@ function setUp() {
 
     foreach ($this->numbers as $num) {
       $info = array(
-        'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $num))),
+        'body' => array(array('value' => $num)),
         'type' => 'page',
         'language' => LANGUAGE_NOT_SPECIFIED,
       );
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchNumbersTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchNumbersTest.php
index 7d1a463..6e81e5e 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchNumbersTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchNumbersTest.php
@@ -51,7 +51,7 @@ function setUp() {
 
     foreach ($this->numbers as $doc => $num) {
       $info = array(
-        'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => $num))),
+        'body' => array(array('value' => $num)),
         'type' => 'page',
         'language' => LANGUAGE_NOT_SPECIFIED,
         'title' => $doc . ' number',
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchPreprocessLangcodeTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchPreprocessLangcodeTest.php
index c5d2451..a8c2e61 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchPreprocessLangcodeTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchPreprocessLangcodeTest.php
@@ -43,7 +43,7 @@ function setUp() {
    */
   function testPreprocessLangcode() {
     // Create a node.
-    $node = $this->drupalCreateNode(array('body' => array('en' => array(array())), 'langcode' => 'en'));
+    $node = $this->drupalCreateNode(array('body' => array(array()), 'langcode' => 'en'));
 
     // First update the index. This does the initial processing.
     node_update_index();
@@ -68,7 +68,7 @@ function testPreprocessStemming() {
     // Create a node.
     $node = $this->drupalCreateNode(array(
       'title' => 'we are testing',
-      'body' => array('en' => array(array())),
+      'body' => array(array()),
       'langcode' => 'en',
     ));
 
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
index 4987b56..b029032 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
@@ -36,7 +36,7 @@ function testRankings() {
       $settings = array(
         'type' => 'page',
         'title' => 'Drupal rocks',
-        'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => "Drupal's search rocks"))),
+        'body' => array(array('value' => "Drupal's search rocks")),
       );
       foreach (array(0, 1) as $num) {
         if ($num == 1) {
@@ -46,7 +46,7 @@ function testRankings() {
               $settings[$node_rank] = 1;
               break;
             case 'relevance':
-              $settings['body'][LANGUAGE_NOT_SPECIFIED][0]['value'] .= " really rocks";
+              $settings['body'][0]['value'] .= " really rocks";
               break;
             case 'recent':
               $settings['created'] = REQUEST_TIME + 3600;
@@ -128,13 +128,13 @@ function testHTMLRankings() {
     foreach ($shuffled_tags as $tag) {
       switch ($tag) {
         case 'a':
-          $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => l('Drupal Rocks', 'node'), 'format' => 'full_html')));
+          $settings['body'] = array(array('value' => l('Drupal Rocks', 'node'), 'format' => 'full_html'));
           break;
         case 'notag':
-          $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => 'Drupal Rocks')));
+          $settings['body'] = array(array('value' => 'Drupal Rocks'));
           break;
         default:
-          $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => "<$tag>Drupal Rocks</$tag>", 'format' => 'full_html')));
+          $settings['body'] = array(array('value' => "<$tag>Drupal Rocks</$tag>", 'format' => 'full_html'));
           break;
       }
       $nodes[$tag] = $this->drupalCreateNode($settings);
@@ -167,7 +167,7 @@ function testHTMLRankings() {
     // Test tags with the same weight against the sorted tags.
     $unsorted_tags = array('u', 'b', 'i', 'strong', 'em');
     foreach ($unsorted_tags as $tag) {
-      $settings['body'] = array(LANGUAGE_NOT_SPECIFIED => array(array('value' => "<$tag>Drupal Rocks</$tag>", 'format' => 'full_html')));
+      $settings['body'] = array(array('value' => "<$tag>Drupal Rocks</$tag>", 'format' => 'full_html'));
       $node = $this->drupalCreateNode($settings);
 
       // Update the search index.
@@ -203,7 +203,7 @@ function testDoubleRankings() {
     $settings = array(
       'type' => 'page',
       'title' => 'Drupal rocks',
-      'body' => array(LANGUAGE_NOT_SPECIFIED => array(array('value' => "Drupal's search rocks"))),
+      'body' => array(array('value' => "Drupal's search rocks")),
       'sticky' => 1,
     );
 
diff --git a/core/modules/search/search.module b/core/modules/search/search.module
index 375c43f..85e58d3 100644
--- a/core/modules/search/search.module
+++ b/core/modules/search/search.module
@@ -5,7 +5,7 @@
  * Enables site-wide keyword searching.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Matches all 'N' Unicode character classes (numbers)
@@ -792,7 +792,7 @@ function search_touch_node($nid) {
 /**
  * Implements hook_node_update_index().
  */
-function search_node_update_index(Node $node) {
+function search_node_update_index(EntityInterface $node) {
   // Transplant links to a node into the target node.
   $result = db_query("SELECT caption FROM {search_node_links} WHERE nid = :nid", array(':nid' => $node->nid), array('target' => 'slave'));
   $output = array();
@@ -807,7 +807,7 @@ function search_node_update_index(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function search_node_update(Node $node) {
+function search_node_update(EntityInterface $node) {
   // Reindex the node when it is updated. The node is automatically indexed
   // when it is added, simply by being added to the node table.
   search_touch_node($node->nid);
diff --git a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
index 138bf34..5f12a66 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
@@ -200,7 +200,7 @@ function drupalGetNodeByTitle($title, $reset = FALSE) {
    *   The following defaults are provided:
    *   - body: Random string using the default filter format:
    *     @code
-   *       $settings['body'][LANGUAGE_NOT_SPECIFIED][0] = array(
+   *       $settings['body'][0] = array(
    *         'value' => $this->randomName(32),
    *         'format' => filter_default_format(),
    *       );
@@ -213,10 +213,7 @@ function drupalGetNodeByTitle($title, $reset = FALSE) {
    *   - status: NODE_PUBLISHED.
    *   - sticky: NODE_NOT_STICKY.
    *   - type: 'page'.
-   *   - langcode: LANGUAGE_NOT_SPECIFIED. (If a 'langcode' key is provided in
-   *     the array, this language code will also be used for a randomly
-   *     generated body field for that language, and the body for
-   *     LANGUAGE_NOT_SPECIFIED will remain empty.)
+   *   - langcode: LANGUAGE_NOT_SPECIFIED.
    *   - uid: The currently logged in user, or the user running test.
    *   - revision: 1. (Backwards-compatible binary flag indicating whether a
    *     new revision should be created; use 1 to specify a new revision.)
@@ -227,7 +224,7 @@ function drupalGetNodeByTitle($title, $reset = FALSE) {
   protected function drupalCreateNode(array $settings = array()) {
     // Populate defaults array.
     $settings += array(
-      'body'      => array(LANGUAGE_NOT_SPECIFIED => array(array())),
+      'body'      => array(array()),
       'title'     => $this->randomName(8),
       'changed'   => REQUEST_TIME,
       'promote'   => NODE_NOT_PROMOTED,
@@ -264,14 +261,10 @@ protected function drupalCreateNode(array $settings = array()) {
     }
 
     // Merge body field value and format separately.
-    $body = array(
+    $settings['body'][0] += array(
       'value' => $this->randomName(32),
       'format' => filter_default_format(),
     );
-    if (empty($settings['body'][$settings['langcode']])) {
-      $settings['body'][$settings['langcode']][0] = array();
-    }
-    $settings['body'][$settings['langcode']][0] += $body;
 
     $node = entity_create('node', $settings);
     if (!empty($settings['revision'])) {
diff --git a/core/modules/statistics/statistics.module b/core/modules/statistics/statistics.module
index f6a9d48..758f8df 100644
--- a/core/modules/statistics/statistics.module
+++ b/core/modules/statistics/statistics.module
@@ -5,7 +5,7 @@
  * Logs and displays content statistics for a site.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 
 /**
@@ -47,7 +47,7 @@ function statistics_permission() {
 /**
  * Implements hook_node_view().
  */
-function statistics_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function statistics_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   if (!empty($node->nid) && $view_mode == 'full' && node_is_page($node) && empty($node->in_preview)) {
     $node->content['#attached']['library'][] = array('statistics', 'drupal.statistics');
     $settings = array('data' => array('nid' => $node->nid), 'url' => url(drupal_get_path('module', 'statistics') . '/statistics.php'));
@@ -199,7 +199,7 @@ function _statistics_format_item($title, $path) {
 /**
  * Implements hook_node_predelete().
  */
-function statistics_node_predelete(Node $node) {
+function statistics_node_predelete(EntityInterface $node) {
   // clean up statistics table when node is deleted
   db_delete('node_counter')
     ->condition('nid', $node->nid)
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
index 30cf24e..5e107e3 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
@@ -134,11 +134,9 @@ function testRenderInlineFullPage() {
     $settings = array(
       'type' => 'page',
       'body' => array(
-        LANGUAGE_NOT_SPECIFIED => array(
-          array(
-            'value' => t('This tests the inline CSS!') . "<?php drupal_add_css('$css', 'inline'); ?>",
-            'format' => $php_format_id,
-          ),
+        array(
+          'value' => t('This tests the inline CSS!') . "<?php drupal_add_css('$css', 'inline'); ?>",
+          'format' => $php_format_id,
         ),
       ),
       'promote' => 1,
diff --git a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityFieldTest.php b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityFieldTest.php
index e3ad6fe..6f42262 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityFieldTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityFieldTest.php
@@ -583,4 +583,28 @@ protected function assertComputedProperties($entity_type) {
     $entity = entity_load($entity_type, $entity->id());
     $this->assertEqual($entity->field_test_text->processed, $target, format_string('%entity_type: Text is processed with the default filter.', array('%entity_type' => $entity_type)));
   }
+
+  /**
+   * Tests using the entity BC decorator with entity properties.
+   *
+   * @todo: Remove once the entit BC decorator is removed.
+   * @see \Drupal\Core\Entity\EntityBCDecorator
+   */
+  public function testBCDecorator() {
+    // Test using comment subject via the BC decorator.
+    module_enable(array('node', 'comment'));
+    $node = $this->drupalCreateNode();
+    $comment = entity_create('comment', array(
+      'nid' => $node->nid,
+      'subject' => 'old-value',
+    ));
+    $comment->save();
+
+    // Test reading.
+    $bc_entity = $comment->getBCEntity();
+    $this->assertEqual($bc_entity->subject, 'old-value', 'Accessing entity property via BC decorator.');
+    // Test writing.
+    $bc_entity->subject = 'new';
+    $this->assertEqual($comment->subject->value, 'new', 'Updated entity property via BC decorator.');
+  }
 }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
index 27f3e6a..582c43e 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
@@ -102,7 +102,7 @@ function setUp() {
       'title' => $this->xss_label,
       'type' => 'article',
       'promote' => NODE_PROMOTED,
-      'field_tags' => array(LANGUAGE_NOT_SPECIFIED => array(array('tid' => $this->term->tid))),
+      'field_tags' => array(array('tid' => $this->term->tid)),
     ));
 
     // Create a test comment on the test node.
@@ -111,7 +111,7 @@ function setUp() {
       'node_type' => $this->node->type,
       'status' => COMMENT_PUBLISHED,
       'subject' => $this->xss_label,
-      'comment_body' => array(LANGUAGE_NOT_SPECIFIED => array($this->randomName())),
+      'comment_body' => array($this->randomName()),
     ));
     comment_save($this->comment);
   }
diff --git a/core/modules/system/tests/modules/paramconverter_test/lib/Drupal/paramconverter_test/TestControllers.php b/core/modules/system/tests/modules/paramconverter_test/lib/Drupal/paramconverter_test/TestControllers.php
index ddb4833..ca95200 100644
--- a/core/modules/system/tests/modules/paramconverter_test/lib/Drupal/paramconverter_test/TestControllers.php
+++ b/core/modules/system/tests/modules/paramconverter_test/lib/Drupal/paramconverter_test/TestControllers.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\paramconverter_test;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Controller routine for testing the paramconverter.
@@ -21,7 +21,7 @@ public function testUserNodeFoo($user, $node, $foo) {
     return $retval;
   }
 
-  public function testNodeSetParent(Node $node, Node $parent) {
+  public function testNodeSetParent(EntityInterface $node, EntityInterface $parent) {
     return "Setting '{$parent->title}' as parent of '{$node->title}'.";
   }
 }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
index 0d5dfd4..24e8150 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
@@ -73,7 +73,7 @@ public function formElement(array $items, $delta, array $element, $langcode, arr
   public function massageFormValues(array $values, array $form, array &$form_state) {
     // Autocomplete widgets do not send their tids in the form, so we must detect
     // them here and process them independently.
-    $terms = array();
+    $items = array();
     $field = $this->field;
 
     // Collect candidate vocabularies.
@@ -89,19 +89,20 @@ public function massageFormValues(array $values, array $form, array &$form_state
       // otherwise, create a new 'autocreate' term for insert/update.
       if ($possibilities = entity_load_multiple_by_properties('taxonomy_term', array('name' => trim($value), 'vid' => array_keys($vocabularies)))) {
         $term = array_pop($possibilities);
+        $item = array('tid' => $term->tid);
       }
       else {
         $vocabulary = reset($vocabularies);
-        $term = array(
-          'tid' => 'autocreate',
+        $term = entity_create('taxonomy_term', array(
           'vid' => $vocabulary->id(),
           'name' => $value,
-        );
+        ));
+        $item = array('tid' => FALSE, 'entity' => $term);
       }
-      $terms[] = (array)$term;
+      $items[] = $item;
     }
 
-    return $terms;
+    return $items;
   }
 
 }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
index ec91070..5f98990 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
@@ -54,8 +54,8 @@ function setUp() {
 
     $node = array();
     $node['type'] = 'article';
-    $node['field_views_testing_tags'][LANGUAGE_NOT_SPECIFIED][]['tid'] = $this->term1->tid;
-    $node['field_views_testing_tags'][LANGUAGE_NOT_SPECIFIED][]['tid'] = $this->term2->tid;
+    $node['field_views_testing_tags'][]['tid'] = $this->term1->tid;
+    $node['field_views_testing_tags'][]['tid'] = $this->term2->tid;
     $this->nodes[] = $this->drupalCreateNode($node);
     $this->nodes[] = $this->drupalCreateNode($node);
   }
diff --git a/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
index 4b1a2b1..33f140d 100644
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -1071,10 +1071,7 @@ function taxonomy_field_validate(EntityInterface $entity = NULL, $field, $instan
  * Implements hook_field_is_empty().
  */
 function taxonomy_field_is_empty($item, $field) {
-  if (!is_array($item) || (empty($item['tid']) && (string) $item['tid'] !== '0')) {
-    return TRUE;
-  }
-  return FALSE;
+  return empty($item['tid']) && empty($item['entity']);
 }
 
 /**
@@ -1362,12 +1359,10 @@ function taxonomy_rdf_mapping() {
  */
 function taxonomy_field_presave(EntityInterface $entity, $field, $instance, $langcode, &$items) {
   foreach ($items as $delta => $item) {
-    if ($item['tid'] == 'autocreate') {
+    if (!$item['tid'] && isset($item['entity'])) {
       unset($item['tid']);
-      $term = entity_create('taxonomy_term', $item);
-      $term->langcode = $langcode;
-      taxonomy_term_save($term);
-      $items[$delta]['tid'] = $term->tid;
+      taxonomy_term_save($item['entity']);
+      $items[$delta]['tid'] = $item['entity']->tid;
     }
   }
 }
@@ -1375,7 +1370,7 @@ function taxonomy_field_presave(EntityInterface $entity, $field, $instance, $lan
 /**
  * Implements hook_node_insert().
  */
-function taxonomy_node_insert(Node $node) {
+function taxonomy_node_insert(EntityInterface $node) {
   // Add taxonomy index entries for the node.
   taxonomy_build_node_index($node);
 }
@@ -1452,7 +1447,7 @@ function taxonomy_build_node_index($node) {
 /**
  * Implements hook_node_update().
  */
-function taxonomy_node_update(Node $node) {
+function taxonomy_node_update(EntityInterface $node) {
   // Always rebuild the node's taxonomy index entries on node save.
   taxonomy_delete_node_index($node);
   taxonomy_build_node_index($node);
@@ -1461,7 +1456,7 @@ function taxonomy_node_update(Node $node) {
 /**
  * Implements hook_node_predelete().
  */
-function taxonomy_node_predelete(Node $node) {
+function taxonomy_node_predelete(EntityInterface $node) {
   // Clean up the {taxonomy_index} table when nodes are deleted.
   taxonomy_delete_node_index($node);
 }
@@ -1469,10 +1464,10 @@ function taxonomy_node_predelete(Node $node) {
 /**
  * Deletes taxonomy index entries for a given node.
  *
- * @param Drupal\node\Plugin\Core\Entity\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   The node entity.
  */
-function taxonomy_delete_node_index(Node $node) {
+function taxonomy_delete_node_index(EntityInterface $node) {
   if (config('taxonomy.settings')->get('maintain_index_table')) {
     db_delete('taxonomy_index')->condition('nid', $node->nid)->execute();
   }
diff --git a/core/modules/tracker/tracker.module b/core/modules/tracker/tracker.module
index 30a0dbb..125b5da 100644
--- a/core/modules/tracker/tracker.module
+++ b/core/modules/tracker/tracker.module
@@ -5,7 +5,7 @@
  * Tracks recent content posted by a user or users.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Implements hook_help().
@@ -193,7 +193,7 @@ function _tracker_user_access($account) {
  *
  * Adds new tracking information for this node since it's new.
  */
-function tracker_node_insert(Node $node, $arg = 0) {
+function tracker_node_insert(EntityInterface $node, $arg = 0) {
   _tracker_add($node->nid, $node->uid, $node->changed);
 }
 
@@ -202,7 +202,7 @@ function tracker_node_insert(Node $node, $arg = 0) {
  *
  * Adds tracking information for this node since it's been updated.
  */
-function tracker_node_update(Node $node, $arg = 0) {
+function tracker_node_update(EntityInterface $node, $arg = 0) {
   _tracker_add($node->nid, $node->uid, $node->changed);
 }
 
@@ -211,7 +211,7 @@ function tracker_node_update(Node $node, $arg = 0) {
  *
  * Deletes tracking information for a node.
  */
-function tracker_node_predelete(Node $node, $arg = 0) {
+function tracker_node_predelete(EntityInterface $node, $arg = 0) {
   db_delete('tracker_node')
     ->condition('nid', $node->nid)
     ->execute();
diff --git a/core/modules/translation/lib/Drupal/translation/Tests/TranslationTest.php b/core/modules/translation/lib/Drupal/translation/Tests/TranslationTest.php
index 6e3dccf..df2c386 100644
--- a/core/modules/translation/lib/Drupal/translation/Tests/TranslationTest.php
+++ b/core/modules/translation/lib/Drupal/translation/Tests/TranslationTest.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\translation\Tests;
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -362,7 +362,7 @@ function createPage($title, $body, $langcode = NULL) {
   /**
    * Creates a translation for a basic page in the specified language.
    *
-   * @param Drupal\node\Node $node
+   * @param \Drupal\Core\Entity\EntityInterface $node
    *   The basic page to create the translation for.
    * @param $title
    *   The title of a basic page in the specified language.
@@ -374,7 +374,7 @@ function createPage($title, $body, $langcode = NULL) {
    * @return
    *   Translation object.
    */
-  function createTranslation(Node $node, $title, $body, $langcode) {
+  function createTranslation(EntityInterface $node, $title, $body, $langcode) {
     $this->drupalGet('node/add/page', array('query' => array('translation' => $node->nid, 'target' => $langcode)));
 
     $field_langcode = LANGUAGE_NOT_SPECIFIED;
diff --git a/core/modules/translation/tests/translation_test.module b/core/modules/translation/tests/translation_test.module
index d5db14d..ac1397f 100644
--- a/core/modules/translation/tests/translation_test.module
+++ b/core/modules/translation/tests/translation_test.module
@@ -5,11 +5,11 @@
  * Mock module for content translation tests.
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Implements hook_node_insert().
  */
-function translation_test_node_insert(Node $node) {
+function translation_test_node_insert(EntityInterface $node) {
   drupal_write_record('node', $node, 'nid');
 }
diff --git a/core/modules/translation/translation.module b/core/modules/translation/translation.module
index a864120..41d8e83 100644
--- a/core/modules/translation/translation.module
+++ b/core/modules/translation/translation.module
@@ -19,7 +19,7 @@
  *   date (0) or needs to be updated (1).
  */
 
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
 
 /**
@@ -248,7 +248,7 @@ function translation_form_node_form_alter(&$form, &$form_state) {
  * translation set. If no language provider is enabled, "fall back" to simple
  * links built through the result of translation_node_get_translations().
  */
-function translation_node_view(Node $node, EntityDisplay $display, $view_mode) {
+function translation_node_view(EntityInterface $node, EntityDisplay $display, $view_mode) {
   // If the site has no translations or is not multilingual we have no content
   // translation links to display.
   if (isset($node->tnid) && language_multilingual() && $translations = translation_node_get_translations($node->tnid)) {
@@ -302,7 +302,7 @@ function translation_node_view(Node $node, EntityDisplay $display, $view_mode) {
 /**
  * Implements hook_node_prepare().
  */
-function translation_node_prepare(Node $node) {
+function translation_node_prepare(EntityInterface $node) {
   // Only act if we are dealing with a content type supporting translations.
   if (translation_supported_type($node->type) &&
     // And it's a new node.
@@ -344,7 +344,7 @@ function translation_node_prepare(Node $node) {
 /**
  * Implements hook_node_insert().
  */
-function translation_node_insert(Node $node) {
+function translation_node_insert(EntityInterface $node) {
   // Only act if we are dealing with a content type supporting translations.
   if (translation_supported_type($node->type)) {
     if (!empty($node->translation_source)) {
@@ -379,7 +379,7 @@ function translation_node_insert(Node $node) {
 /**
  * Implements hook_node_update().
  */
-function translation_node_update(Node $node) {
+function translation_node_update(EntityInterface $node) {
   // Only act if we are dealing with a content type supporting translations.
   if (translation_supported_type($node->type)) {
     if (isset($node->translation) && $node->translation && !empty($node->langcode) && $node->tnid) {
@@ -408,7 +408,7 @@ function translation_node_update(Node $node) {
  *
  * Ensures that duplicate translations can't be created for the same source.
  */
-function translation_node_validate(Node $node, $form, &$form_state) {
+function translation_node_validate(EntityInterface $node, $form, &$form_state) {
   // Only act on translatable nodes with a tnid or translation_source.
   $form_node = $form_state['controller']->getEntity($form_state);
   if (translation_supported_type($node->type) && (!empty($node->tnid) || !empty($form_node->translation_source->nid))) {
@@ -423,7 +423,7 @@ function translation_node_validate(Node $node, $form, &$form_state) {
 /**
  * Implements hook_node_predelete().
  */
-function translation_node_predelete(Node $node) {
+function translation_node_predelete(EntityInterface $node) {
   // Only act if we are dealing with a content type supporting translations.
   if (translation_supported_type($node->type)) {
     translation_remove_from_set($node);
diff --git a/core/modules/translation/translation.pages.inc b/core/modules/translation/translation.pages.inc
index 53b91c8..e3ca960 100644
--- a/core/modules/translation/translation.pages.inc
+++ b/core/modules/translation/translation.pages.inc
@@ -6,12 +6,12 @@
  */
 
 use Drupal\Component\Utility\NestedArray;
-use Drupal\node\Plugin\Core\Entity\Node;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Page callback: Displays a list of a node's translations.
  *
- * @param Drupal\node\Node $node
+ * @param \Drupal\Core\Entity\EntityInterface $node
  *   A node entity.
  *
  * @return
@@ -19,7 +19,7 @@
  *
  * @see translation_menu()
  */
-function translation_node_overview(Node $node) {
+function translation_node_overview(EntityInterface $node) {
   include_once DRUPAL_ROOT . '/core/includes/language.inc';
 
   if ($node->tnid) {
diff --git a/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php b/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
index 7e8fc93..4a06511 100644
--- a/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
@@ -93,13 +93,13 @@ protected function setUp() {
       $term = $this->createTerm($this->vocabulary);
 
       $values = array('created' => $time, 'type' => 'page');
-      $values[$this->field_name][LANGUAGE_NOT_SPECIFIED][]['tid'] = $term->tid;
+      $values[$this->field_name][]['tid'] = $term->tid;
 
       // Make every other node promoted.
       if ($i % 2) {
         $values['promote'] = TRUE;
       }
-      $values['body'][LANGUAGE_NOT_SPECIFIED][]['value'] = l('Node ' . 1, 'node/' . 1);
+      $values['body'][]['value'] = l('Node ' . 1, 'node/' . 1);
 
       $node = $this->drupalCreateNode($values);