diff --git includes/common.inc includes/common.inc
index 5a7e340..d903801 100644
--- includes/common.inc
+++ includes/common.inc
@@ -6999,16 +6999,20 @@ function entity_form_field_validate($entity_type, $form, &$form_state) {
  *
  * During the submission handling of an entity form's "Save", "Preview", and
  * possibly other buttons, the form state's entity needs to be updated with the
- * submitted form values. Each entity form implements its own
- * $form['#builder_function'] for doing this, appropriate for the particular
- * entity and form. Many of these entity builder functions can call this helper
- * function to re-use its logic of copying $form_state['values'][PROPERTY]
- * values to $entity->PROPERTY for all entries in $form_state['values'] that are
- * not field data, and calling field_attach_submit() to copy field data.
+ * submitted form values. Each entity form implements its own builder function
+ * for doing this, appropriate for the particular entity and form, whereas
+ * modules may specify additional builder functions in $form['#entity_builders']
+ * for copying the form values of added form elements to entity properties.
+ * Many of the main entity builder functions can call this helper function to
+ * re-use its logic of copying $form_state['values'][PROPERTY] values to
+ * $entity->PROPERTY for all entries in $form_state['values'] that are not field
+ * data, and calling field_attach_submit() to copy field data. Apart from that
+ * this helper invokes any additional builder functions that have been specified
+ * in $form['#entity_builders'].
  *
  * For some entity forms (e.g., forms with complex non-field data and forms that
  * simultaneously edit multiple entities), this behavior may be inappropriate,
- * so the #builder_function for such forms needs to implement the required
+ * so the builder function for such forms needs to implement the required
  * functionality instead of calling this function.
  */
 function entity_form_submit_build_entity($entity_type, $entity, $form, &$form_state) {
@@ -7023,6 +7027,13 @@ function entity_form_submit_build_entity($entity_type, $entity, $form, &$form_st
     $entity->$key = $value;
   }
 
+  // Invoke all specified builders for copying form values to entity properties.
+  if (isset($form['#entity_builders'])) {
+    foreach ($form['#entity_builders'] as $function) {
+      $function($entity_type, $entity, $form, $form_state);
+    }
+  }
+
   // Copy field values to the entity.
   if ($info['fieldable']) {
     field_attach_submit($entity_type, $entity, $form, $form_state);
diff --git modules/comment/comment.module modules/comment/comment.module
index 4de8bd6..c62d038 100644
--- modules/comment/comment.module
+++ modules/comment/comment.module
@@ -1968,7 +1968,6 @@ function comment_form($form, &$form_state, $comment) {
 
   // Attach fields.
   $comment->node_type = 'comment_node_' . $node->type;
-  $form['#builder_function'] = 'comment_form_submit_build_comment';
   field_attach_form('comment', $comment, $form, $form_state);
 
   return $form;
@@ -1978,7 +1977,7 @@ function comment_form($form, &$form_state, $comment) {
  * Build a preview from submitted form values.
  */
 function comment_form_build_preview($form, &$form_state) {
-  $comment = $form['#builder_function']($form, $form_state);
+  $comment = comment_form_submit_build_comment($form, $form_state);
   $form_state['comment_preview'] = comment_preview($comment);
   $form_state['rebuild'] = TRUE;
 }
@@ -2119,7 +2118,7 @@ function comment_submit($comment) {
 /**
  * Updates the form state's comment entity by processing this submission's values.
  *
- * This is the default #builder_function for the comment form. It is called
+ * This is the default builder function for the comment form. It is called
  * during the "Save" and "Preview" submit handlers to retrieve the entity to
  * save or preview. This function can also be called by a "Next" button of a
  * wizard to update the form state's entity with the current step's values
@@ -2139,7 +2138,7 @@ function comment_form_submit_build_comment($form, &$form_state) {
  */
 function comment_form_submit($form, &$form_state) {
   $node = node_load($form_state['values']['nid']);
-  $comment = $form['#builder_function']($form, $form_state);
+  $comment = comment_form_submit_build_comment($form, $form_state);
   if (user_access('post comments') && (user_access('administer comments') || $node->comment == COMMENT_NODE_OPEN)) {
     // Save the anonymous user information to a cookie for reuse.
     if (!$comment->uid) {
diff --git modules/field/tests/field_test.entity.inc modules/field/tests/field_test.entity.inc
index 39f2a69..f16c04f 100644
--- modules/field/tests/field_test.entity.inc
+++ modules/field/tests/field_test.entity.inc
@@ -352,7 +352,6 @@ function field_test_entity_form($form, &$form_state, $entity, $add = FALSE) {
   }
 
   // Add field widgets.
-  $form['#builder_function'] = 'field_test_entity_form_submit_builder';
   field_attach_form('test_entity', $entity, $form, $form_state);
 
   if (!$add) {
@@ -384,7 +383,7 @@ function field_test_entity_form_validate($form, &$form_state) {
  * Submit handler for field_test_entity_form().
  */
 function field_test_entity_form_submit($form, &$form_state) {
-  $entity = $form['#builder_function']($form, $form_state);
+  $entity = field_test_entity_form_submit_build_test_entity($form, $form_state);
   $insert = empty($entity->ftid);
   field_test_entity_save($entity);
 
@@ -404,7 +403,7 @@ function field_test_entity_form_submit($form, &$form_state) {
 /**
  * Updates the form state's entity by processing this submission's values.
  */
-function field_test_entity_form_submit_builder($form, &$form_state) {
+function field_test_entity_form_submit_build_test_entity($form, &$form_state) {
   $entity = $form_state['test_entity'];
   entity_form_submit_build_entity('test_entity', $entity, $form, $form_state);
   return $entity;
diff --git modules/node/node.pages.inc modules/node/node.pages.inc
index c39da6d..17de957 100644
--- modules/node/node.pages.inc
+++ modules/node/node.pages.inc
@@ -295,9 +295,7 @@ function node_form($form, &$form_state, $node) {
   }
   $form += array('#submit' => array());
 
-  $form['#builder_function'] = 'node_form_submit_build_node';
   field_attach_form('node', $node, $form, $form_state, $node->language);
-
   return $form;
 }
 
@@ -316,7 +314,7 @@ function node_form_delete_submit($form, &$form_state) {
 
 
 function node_form_build_preview($form, &$form_state) {
-  $node = $form['#builder_function']($form, $form_state);
+  $node = node_form_submit_build_node($form, $form_state);
   $form_state['node_preview'] = node_preview($node);
   $form_state['rebuild'] = TRUE;
 }
@@ -399,7 +397,7 @@ function theme_node_preview($variables) {
 }
 
 function node_form_submit($form, &$form_state) {
-  $node = $form['#builder_function']($form, $form_state);
+  $node = node_form_submit_build_node($form, $form_state);
   $insert = empty($node->nid);
   node_save($node);
   $node_link = l(t('view'), 'node/' . $node->nid);
@@ -432,7 +430,7 @@ function node_form_submit($form, &$form_state) {
 /**
  * Updates the form state's node entity by processing this submission's values.
  *
- * This is the default #builder_function for the node form. It is called
+ * This is the default builder function for the node form. It is called
  * during the "Save" and "Preview" submit handlers to retrieve the entity to
  * save or preview. This function can also be called by a "Next" button of a
  * wizard to update the form state's entity with the current step's values
diff --git modules/taxonomy/taxonomy.admin.inc modules/taxonomy/taxonomy.admin.inc
index 18a9c15..66a2dc8 100644
--- modules/taxonomy/taxonomy.admin.inc
+++ modules/taxonomy/taxonomy.admin.inc
@@ -679,7 +679,6 @@ function taxonomy_form_term($form, &$form_state, $edit = array(), $vocabulary =
   $form['#term'] = (array) $term;
   $form['#term']['parent'] = $parent;
   $form['#vocabulary'] = $vocabulary;
-  $form['#builder_function'] = 'taxonomy_form_term_submit_builder';
 
   // Check for confirmation forms.
   if (isset($form_state['confirm_delete'])) {
@@ -830,7 +829,7 @@ function taxonomy_form_term_submit($form, &$form_state) {
     return;
   }
 
-  $term = $form['#builder_function']($form, $form_state);
+  $term = taxonomy_form_term_submit_build_taxonomy_term($form, $form_state);
 
   $status = taxonomy_term_save($term);
   switch ($status) {
@@ -873,7 +872,7 @@ function taxonomy_form_term_submit($form, &$form_state) {
 /**
  * Updates the form state's term entity by processing this submission's values.
  */
-function taxonomy_form_term_submit_builder($form, &$form_state) {
+function taxonomy_form_term_submit_build_taxonomy_term($form, &$form_state) {
   $term = $form_state['term'];
   entity_form_submit_build_entity('taxonomy_term', $term, $form, $form_state);