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diff --git a/www/wiki/includes/cache/localisation/LCStore.php b/www/wiki/includes/cache/localisation/LCStore.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * Interface for the persistence layer of LocalisationCache.
+ *
+ * The persistence layer is two-level hierarchical cache. The first level
+ * is the language, the second level is the item or subitem.
+ *
+ * Since the data for a whole language is rebuilt in one operation, it needs
+ * to have a fast and atomic method for deleting or replacing all of the
+ * current data for a given language. The interface reflects this bulk update
+ * operation. Callers writing to the cache must first call startWrite(), then
+ * will call set() a couple of thousand times, then will call finishWrite()
+ * to commit the operation. When finishWrite() is called, the cache is
+ * expected to delete all data previously stored for that language.
+ *
+ * The values stored are PHP variables suitable for serialize(). Implementations
+ * of LCStore are responsible for serializing and unserializing.
+ */
+interface LCStore {
+
+	/**
+	 * Get a value.
+	 * @param string $code Language code
+	 * @param string $key Cache key
+	 */
+	function get( $code, $key );
+
+	/**
+	 * Start a write transaction.
+	 * @param string $code Language code
+	 */
+	function startWrite( $code );
+
+	/**
+	 * Finish a write transaction.
+	 */
+	function finishWrite();
+
+	/**
+	 * Set a key to a given value. startWrite() must be called before this
+	 * is called, and finishWrite() must be called afterwards.
+	 * @param string $key
+	 * @param mixed $value
+	 */
+	function set( $key, $value );
+
+}