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diff --git a/includes/title/ForeignTitleFactory.php b/includes/title/ForeignTitleFactory.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
+ * @license GPL 2+
+ */
+
+/**
+ * A parser that translates page titles into ForeignTitle objects.
+ */
+interface ForeignTitleFactory {
+	/**
+	 * Creates a ForeignTitle object based on the page title, and optionally the
+	 * namespace ID, of a page on a foreign wiki. These values could be, for
+	 * example, the <title> and <ns> attributes found in an XML dump.
+	 *
+	 * @param string $title The page title
+	 * @param int|null $ns The namespace ID, or null if this data is not available
+	 * @return ForeignTitle
+	 */
+	public function createForeignTitle( $title, $ns = null );
+}