diff --git a/ezp/Persistence/Content/Type/Interfaces/Handler.php b/ezp/Persistence/Content/Type/Interfaces/Handler.php
index <HASH>..<HASH> 100644
--- a/ezp/Persistence/Content/Type/Interfaces/Handler.php
+++ b/ezp/Persistence/Content/Type/Interfaces/Handler.php
@@ -84,12 +84,22 @@ interface Handler
     public function copy( $userId, $contentTypeId );
 
     /**
-     * @param int $groupId
-     * @param int $contentTypeId
+     * Unlink a content type group from a content type
+     *
+     * @param mixed $groupId
+     * @param mixed $contentTypeId
      */
     public function unlink( $groupId, $contentTypeId );
 
     /**
+     * Link a content type group with a content type
+     *
+     * @param mixed $groupId
+     * @param mixed $contentTypeId
+     */
+    public function link( $groupId, $contentTypeId );
+
+    /**
      * @param int $contentTypeId
      * @param int $groupId
      */
Added link method

Added a link method to make it possible to associate groups with content
types.