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diff --git a/3rdparty/Sabre/CardDAV/Backend/Abstract.php b/3rdparty/Sabre/CardDAV/Backend/Abstract.php
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+<?php
+
+/**
+ * Abstract Backend class
+ * 
+ * @package Sabre
+ * @subpackage CardDAV
+ * @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
+ */
+
+/**
+ * This class serves as a base-class for addressbook backends
+ *
+ * Note that there are references to 'addressBookId' scattered throughout the 
+ * class. The value of the addressBookId is completely up to you, it can be any 
+ * arbitrary value you can use as an unique identifier.
+ */
+abstract class Sabre_CardDAV_Backend_Abstract {
+
+    /**
+     * Returns the list of addressbooks for a specific user.
+     *
+     * Every addressbook should have the following properties:
+     *   id - an arbitrary unique id
+     *   uri - the 'basename' part of the url
+     *   principaluri - Same as the passed parameter
+     *
+     * Any additional clark-notation property may be passed besides this. Some 
+     * common ones are :
+     *   {DAV:}displayname
+     *   {urn:ietf:params:xml:ns:carddav}addressbook-description
+     *   {http://calendarserver.org/ns/}getctag
+     * 
+     * @param string $principalUri 
+     * @return array 
+     */
+    public abstract function getAddressBooksForUser($principalUri); 
+
+    /**
+     * Updates an addressbook's properties
+     *
+     * See Sabre_DAV_IProperties for a description of the mutations array, as 
+     * well as the return value. 
+     *
+     * @param mixed $addressBookId
+     * @param array $mutations
+     * @see Sabre_DAV_IProperties::updateProperties
+     * @return bool|array
+     */
+    public abstract function updateAddressBook($addressBookId, array $mutations); 
+
+    /**
+     * Creates a new address book 
+     *
+     * @param string $principalUri 
+     * @param string $url Just the 'basename' of the url. 
+     * @param array $properties 
+     * @return void
+     */
+    abstract public function createAddressBook($principalUri, $url, array $properties); 
+
+    /**
+     * Deletes an entire addressbook and all its contents
+     *
+     * @param mixed $addressBookId 
+     * @return void
+     */
+    abstract public function deleteAddressBook($addressBookId); 
+
+    /**
+     * Returns all cards for a specific addressbook id. 
+     *
+     * This method should return the following properties for each card:
+     *   * carddata - raw vcard data
+     *   * uri - Some unique url
+     *   * lastmodified - A unix timestamp
+
+     * @param mixed $addressbookId 
+     * @return array 
+     */
+    public abstract function getCards($addressbookId); 
+
+    /**
+     * Returns a specfic card
+     * 
+     * @param mixed $addressBookId 
+     * @param string $cardUri 
+     * @return void
+     */
+    public abstract function getCard($addressBookId, $cardUri); 
+
+    /**
+     * Creates a new card
+     * 
+     * @param mixed $addressBookId 
+     * @param string $cardUri 
+     * @param string $cardData 
+     * @return bool 
+     */
+    abstract public function createCard($addressBookId, $cardUri, $cardData); 
+
+    /**
+     * Updates a card
+     * 
+     * @param mixed $addressBookId 
+     * @param string $cardUri 
+     * @param string $cardData 
+     * @return bool 
+     */
+    abstract public function updateCard($addressBookId, $cardUri, $cardData); 
+
+    /**
+     * Deletes a card
+     * 
+     * @param mixed $addressBookId 
+     * @param string $cardUri 
+     * @return bool 
+     */
+    abstract public function deleteCard($addressBookId, $cardUri); 
+
+}