? hook_potx.diff
Index: potx.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/potx/Attic/potx.inc,v
retrieving revision 1.1.2.17.2.7.2.14
diff -u -p -r1.1.2.17.2.7.2.14 potx.inc
--- potx.inc	26 Sep 2008 10:44:32 -0000	1.1.2.17.2.7.2.14
+++ potx.inc	5 Oct 2008 17:24:12 -0000
@@ -131,6 +131,11 @@ function _potx_process_file($file_path, 
     _potx_find_info_file_strings($file_path, $file_name, $save_callback, $api_version);
     return;
   }
+  // The .potx files return return custom strings.
+  elseif ($name_parts['extension'] == 'potx') {
+    _potx_find_potx_file_strings($file_path, $file_name, $save_callback);
+    return;
+  }
   elseif ($name_parts['extension'] == 'js' && $api_version > POTX_API_5) {
     _potx_parse_js_file($code, $file_name, $save_callback);
   }
@@ -1074,6 +1079,29 @@ function _potx_find_info_file_strings($f
 }
 
 /**
+ * Call method in a .potx file and add relevant strings to the list.
+ *
+ * @param $file_path
+ *   Complete file path to load contents with.
+ * @param $file_name
+ *   Stripped file name to use in outpout.
+ * @param $save_callback
+ *   Function to call to save individual strings.
+ */
+function _potx_find_potx_file_strings($file_path, $file_name, $save_callback) {
+  include_once($file_path);
+  // Can't use module_invoke() because the module may not be enabled.
+  $module = basename($file_path, '.potx');
+  $function = $module . '_pots';
+  if (function_exists($function)) {
+    $strings = call_user_func($function);
+    foreach ($strings as $string) {
+      $save_callback($string, $file_name);
+    }
+  }
+}
+
+/**
  * Parse a JavaScript file for translatables. Only for Drupal 6.
  *
  * Extracts strings wrapped in Drupal.t() and Drupal.formatPlural()
@@ -1147,7 +1175,7 @@ function _potx_parse_js_string($string) 
 function _potx_explore_dir($path = '', $basename = '*', $api_version = POTX_API_6) {
   // It would be so nice to just use GLOB_BRACE, but it is not available on all
   // operarting systems, so we are working around the missing functionality.
-  $extensions = array('php', 'inc', 'module', 'engine', 'theme', 'install', 'info', 'profile');
+  $extensions = array('php', 'inc', 'module', 'engine', 'theme', 'install', 'info', 'profile', 'potx');
   if ($api_version > POTX_API_5) {
     $extensions[] = 'js';
   }