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diff --git a/www/wiki/includes/interwiki/InterwikiLookup.php b/www/wiki/includes/interwiki/InterwikiLookup.php
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+<?php
+namespace MediaWiki\Interwiki;
+
+/**
+ * Service interface for looking up Interwiki records.
+ *
+ * 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
+ */
+use Interwiki;
+
+/**
+ * Service interface for looking up Interwiki records.
+ *
+ * @since 1.28
+ */
+interface InterwikiLookup {
+
+	/**
+	 * Check whether an interwiki prefix exists
+	 *
+	 * @param string $prefix Interwiki prefix to use
+	 * @return bool Whether it exists
+	 */
+	public function isValidInterwiki( $prefix );
+
+	/**
+	 * Fetch an Interwiki object
+	 *
+	 * @param string $prefix Interwiki prefix to use
+	 * @return Interwiki|null|bool
+	 */
+	public function fetch( $prefix );
+
+	/**
+	 * Returns information about all interwiki prefixes, in the form of rows
+	 * of the interwiki table. Each row may have the following keys:
+	 *
+	 * - iw_prefix: the prefix. Always present.
+	 * - iw_url: the URL to use for linking, with $1 as a placeholder for the target page.
+	 *           Always present.
+	 * - iw_api: the URL of the API. Optional.
+	 * - iw_wikiid: the wiki ID (usually the database name for local wikis). Optional.
+	 * - iw_local: whether the wiki is local, and the "magic redirect" mechanism should apply.
+	 *             Defaults to false.
+	 * - iw_trans: whether "scary transclusion" is allowed for this site.
+	 *             Defaults to false.
+	 *
+	 * @param string|null $local If set, limits output to local/non-local interwikis
+	 * @return array[] interwiki rows.
+	 */
+	public function getAllPrefixes( $local = null );
+
+	/**
+	 * Purge the in-process and persistent object cache for an interwiki prefix
+	 * @param string $prefix
+	 */
+	public function invalidateCache( $prefix );
+
+}