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diff --git a/3rdparty/ZendFeed/Writer/Renderer/RendererInterface.php b/3rdparty/ZendFeed/Writer/Renderer/RendererInterface.php
new file mode 100644
index 000000000..b2e0e00a3
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+++ b/3rdparty/ZendFeed/Writer/Renderer/RendererInterface.php
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+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Feed\Writer\Renderer;
+
+use DOMDocument;
+use DOMElement;
+
+/**
+*/
+interface RendererInterface
+{
+    /**
+     * Render feed/entry
+     *
+     * @return void
+     */
+    public function render();
+
+    /**
+     * Save feed and/or entry to XML and return string
+     *
+     * @return string
+     */
+    public function saveXml();
+
+    /**
+     * Get DOM document
+     *
+     * @return DOMDocument
+     */
+    public function getDomDocument();
+
+    /**
+     * Get document element from DOM
+     *
+     * @return DOMElement
+     */
+    public function getElement();
+
+    /**
+     * Get data container containing feed items
+     *
+     * @return mixed
+     */
+    public function getDataContainer();
+
+    /**
+     * Should exceptions be ignored?
+     *
+     * @return mixed
+     */
+    public function ignoreExceptions();
+
+    /**
+     * Get list of thrown exceptions
+     *
+     * @return array
+     */
+    public function getExceptions();
+
+    /**
+     * Set the current feed type being exported to "rss" or "atom". This allows
+     * other objects to gracefully choose whether to execute or not, depending
+     * on their appropriateness for the current type, e.g. renderers.
+     *
+     * @param string $type
+     */
+    public function setType($type);
+
+    /**
+     * Retrieve the current or last feed type exported.
+     *
+     * @return string Value will be "rss" or "atom"
+     */
+    public function getType();
+
+    /**
+     * Sets the absolute root element for the XML feed being generated. This
+     * helps simplify the appending of namespace declarations, but also ensures
+     * namespaces are added to the root element - not scattered across the entire
+     * XML file - may assist namespace unsafe parsers and looks pretty ;).
+     *
+     * @param DOMElement $root
+     */
+    public function setRootElement(DOMElement $root);
+
+    /**
+     * Retrieve the absolute root element for the XML feed being generated.
+     *
+     * @return DOMElement
+     */
+    public function getRootElement();
+}