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diff --git a/3rdparty/Sabre/DAVACL/IPrincipalBackend.php b/3rdparty/Sabre/DAVACL/IPrincipalBackend.php
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+++ b/3rdparty/Sabre/DAVACL/IPrincipalBackend.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * Implement this interface to create your own principal backends.
+ *
+ * Creating backends for principals is entirely optional. You can also 
+ * implement Sabre_DAVACL_IPrincipal directly. This interface is used solely by 
+ * Sabre_DAVACL_AbstractPrincipalCollection.
+ *
+ * @package Sabre
+ * @subpackage DAVACL
+ * @copyright Copyright (C) 2007-2011 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_DAVACL_IPrincipalBackend {
+
+    /**
+     * Returns a list of principals based on a prefix.
+     *
+     * This prefix will often contain something like 'principals'. You are only 
+     * expected to return principals that are in this base path.
+     *
+     * You are expected to return at least a 'uri' for every user, you can 
+     * return any additional properties if you wish so. Common properties are:
+     *   {DAV:}displayname 
+     *   {http://sabredav.org/ns}email-address - This is a custom SabreDAV 
+     *     field that's actualy injected in a number of other properties. If
+     *     you have an email address, use this property.
+     * 
+     * @param string $prefixPath 
+     * @return array 
+     */
+    function getPrincipalsByPrefix($prefixPath);
+
+    /**
+     * Returns a specific principal, specified by it's path.
+     * The returned structure should be the exact same as from 
+     * getPrincipalsByPrefix. 
+     * 
+     * @param string $path 
+     * @return array 
+     */
+    function getPrincipalByPath($path);
+
+    /**
+     * Returns the list of members for a group-principal 
+     * 
+     * @param string $principal 
+     * @return array 
+     */
+    function getGroupMemberSet($principal);
+
+    /**
+     * Returns the list of groups a principal is a member of 
+     * 
+     * @param string $principal 
+     * @return array 
+     */
+    function getGroupMembership($principal);
+
+    /**
+     * Updates the list of group members for a group principal.
+     *
+     * The principals should be passed as a list of uri's. 
+     * 
+     * @param string $principal 
+     * @param array $members 
+     * @return void
+     */
+    function setGroupMemberSet($principal, array $members); 
+
+}