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diff --git a/www/wiki/includes/site/SiteLookup.php b/www/wiki/includes/site/SiteLookup.php
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+<?php
+
+/**
+ * Interface for service objects providing a lookup of Site objects.
+ *
+ * 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
+ *
+ * @since 1.25
+ *
+ * @file
+ * @ingroup Site
+ *
+ * @license GNU GPL v2+
+ */
+interface SiteLookup {
+
+	/**
+	 * Returns the site with provided global id, or null if there is no such site.
+	 *
+	 * @since 1.25
+	 *
+	 * @param string $globalId
+	 *
+	 * @return Site|null
+	 */
+	public function getSite( $globalId );
+
+	/**
+	 * Returns a list of all sites.
+	 *
+	 * @since 1.25
+	 *
+	 * @return SiteList
+	 */
+	public function getSites();
+
+}