diff -r 000000000000 -r 7c0001cacf8e src/pyams_content/interfaces/container.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/interfaces/container.py	Thu Oct 08 13:37:29 2015 +0200
@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+# import standard library
+
+# import interfaces
+from zope.container.interfaces import IContainer
+
+# import packages
+from zope.interface import Interface
+
+
+#
+# Containers interfaces
+#
+
+class IOrderedContainerOrder(Interface):
+    """Ordered containers interface"""
+
+    def updateOrder(self, order):
+        """Reset items in given order
+
+        @order: new ordered list of container's items keys
+        """
+
+    def moveFirst(self, key):
+        """Move item with given key to first position"""
+
+    def moveUp(self, key):
+        """Move item with given key one position up"""
+
+    def moveDown(self, key):
+        """Move item with given key one position down"""
+
+    def moveLast(self, key):
+        """Move item with given key to last position"""
+
+
+class IOrderedContainer(IContainer, IOrderedContainerOrder):
+    """Marker interface for ordered containers"""