diff --git a/libraries/cms/node/interface.php b/libraries/cms/node/interface.php
new file mode 100644
index 0000000000000..95181f3ab8e62
--- /dev/null
+++ b/libraries/cms/node/interface.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * @package     Joomla.Libraries
+ * @subpackage  Node
+ *
+ * @copyright   Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE
+ */
+
+/**
+ * A Node interface for Joomla
+ * If you are creating a system that might create something
+ * similar to a tree, implement this interface for its nodes.
+ *
+ * @since  3.4
+ */
+interface JNodeInterface
+{
+	/**
+	 * Set the parent of this node
+	 *
+	 * If the node already has a parent, the link is unset
+	 *
+	 * @param   mixed  $parent  JNodeInterface for the parent to be set or null
+	 *
+	 * @return  void
+	 * 
+	 * @since   3.4
+	 */
+	public function setParent($parent);
+
+	/**
+	 * Add child to this node
+	 *
+	 * If the child already has a parent, the link is unset
+	 *
+	 * @param   JNodeInterface  $child  The child to be added.
+	 *
+	 * @return  void
+	 * 
+	 * @since   3.4
+	 */
+	public function addChild($child);
+
+	/**
+	 * Remove a specific child
+	 *
+	 * @param   mixed  $child  An identifier for the child node
+	 *
+	 * @return  void
+	 * 
+	 * @since   3.4
+	 */
+	public function removeChild($child);
+
+	/**
+	 * Get the children of this node
+	 *
+	 * @param   boolean  $recursive  False by default
+	 *
+	 * @return  JNodeInterface[]   The children
+	 * 
+	 * @since   3.4
+	 */
+	public function &getChildren($recursive = false);
+
+	/**
+	 * Get the parent of this node
+	 *
+	 * @return  JNodeInterface   The parent of this node or null
+	 *
+	 * @since   3.4
+	 */
+	public function getParent();
+
+	/**
+	 * Test if this node has children
+	 *
+	 * @return  boolean   True if there is a child
+	 *
+	 * @since   3.4
+	 */
+	public function hasChildren();
+
+	/**
+	 * Test if this node has a parent
+	 *
+	 * @return  boolean   True if there is a parent
+	 *
+	 * @since   3.4
+	 */
+	public function hasParent();
+}
diff --git a/libraries/legacy/categories/categories.php b/libraries/legacy/categories/categories.php
index cc48525efeecb..21e5c46624eda 100644
--- a/libraries/legacy/categories/categories.php
+++ b/libraries/legacy/categories/categories.php
@@ -370,7 +370,7 @@ protected function _load($id)
  *
  * @since  11.1
  */
-class JCategoryNode extends JObject
+class JCategoryNode extends JObject implements JNodeInterface
 {
 	/**
 	 * Primary key