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diff --git a/includes/title/TitleParser.php b/includes/title/TitleParser.php
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+<?php
+/**
+ * A title parser service for %MediaWiki.
+ *
+ * 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
+ * @license GPL 2+
+ * @author Daniel Kinzler
+ */
+
+/**
+ * A title parser service for %MediaWiki.
+ *
+ * This is designed to encapsulate knowledge about conventions for the title
+ * forms to be used in the database, in urls, in wikitext, etc.
+ *
+ * @see https://www.mediawiki.org/wiki/Requests_for_comment/TitleValue
+ */
+interface TitleParser {
+	/**
+	 * Parses the given text and constructs a TitleValue. Normalization
+	 * is applied according to the rules appropriate for the form specified by $form.
+	 *
+	 * @note this only parses local page links, interwiki-prefixes etc. are not considered!
+	 *
+	 * @param string $text The text to parse
+	 * @param int $defaultNamespace Namespace to assume per default (usually NS_MAIN)
+	 *
+	 * @throws MalformedTitleException If the text is not a valid representation of a page title.
+	 * @return TitleValue
+	 */
+	public function parseTitle( $text, $defaultNamespace );
+}