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diff --git a/includes/title/NaiveForeignTitleFactory.php b/includes/title/NaiveForeignTitleFactory.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 on a foreign wiki into ForeignTitle
+ * objects, with no knowledge of the namespace setup on the foreign site.
+ */
+class NaiveForeignTitleFactory implements 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.
+	 *
+	 * Although exported XML dumps have contained a map of namespace IDs to names
+	 * since MW 1.5, the importer used to completely ignore the <siteinfo> tag
+	 * before MW 1.25.  It is therefore possible that custom XML dumps (i.e. not
+	 * generated by Special:Export) have been created without this metadata.
+	 * As a result, this code falls back to using namespace data for the local
+	 * wiki (similar to buggy pre-1.25 behaviour) if $ns is not supplied.
+	 *
+	 * @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 ) {
+		$pieces = explode( ':', $title, 2 );
+
+		global $wgContLang;
+
+		// Can we assume that the part of the page title before the colon is a
+		// namespace name?
+		//
+		// XML export schema version 0.5 and earlier (MW 1.18 and earlier) does not
+		// contain a <ns> tag, so we need to be able to handle that case.
+		//
+		// If we know the namespace ID, we assume a non-zero namespace ID means
+		// the ':' sets off a valid namespace name. If we don't know the namespace
+		// ID, we fall back to using the local wiki's namespace names to resolve
+		// this -- better than nothing, and mimics the old crappy behavior
+		$isNamespacePartValid = is_null( $ns ) ?
+			( $wgContLang->getNsIndex( $pieces[0] ) !== false ) :
+			$ns != 0;
+
+		if ( count( $pieces ) === 2 && $isNamespacePartValid ) {
+			list( $namespaceName, $pageName ) = $pieces;
+		} else {
+			$namespaceName = '';
+			$pageName = $title;
+		}
+
+		return new ForeignTitle( $ns, $namespaceName, $pageName );
+	}
+}