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diff --git a/includes/title/NaiveImportTitleFactory.php b/includes/title/NaiveImportTitleFactory.php
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+++ b/includes/title/NaiveImportTitleFactory.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 class to convert page titles on a foreign wiki (ForeignTitle objects) into
+ * page titles on the local wiki (Title objects), using a default namespace
+ * mapping.
+ *
+ * For built-in namespaces (0 <= ID < 100), we try to find a local namespace
+ * with the same namespace ID as the foreign page. If no such namespace exists,
+ * or the namespace ID is unknown or > 100, we look for a local namespace with
+ * a matching namespace name. If that can't be found, we dump the page in the
+ * main namespace as a last resort.
+ */
+class NaiveImportTitleFactory implements ImportTitleFactory {
+	/**
+	 * Determines which local title best corresponds to the given foreign title.
+	 * If such a title can't be found or would be locally invalid, null is
+	 * returned.
+	 *
+	 * @param ForeignTitle $foreignTitle The ForeignTitle to convert
+	 * @return Title|null
+	 */
+	public function createTitleFromForeignTitle( ForeignTitle $foreignTitle ) {
+		global $wgContLang;
+
+		if ( $foreignTitle->isNamespaceIdKnown() ) {
+			$foreignNs = $foreignTitle->getNamespaceId();
+
+			// For built-in namespaces (0 <= ID < 100), we try to find a local NS with
+			// the same namespace ID
+			if ( $foreignNs < 100 && MWNamespace::exists( $foreignNs ) ) {
+				return Title::makeTitleSafe( $foreignNs, $foreignTitle->getText() );
+			}
+		}
+
+		// Do we have a local namespace by the same name as the foreign
+		// namespace?
+		$targetNs = $wgContLang->getNsIndex( $foreignTitle->getNamespaceName() );
+		if ( $targetNs !== false ) {
+			return Title::makeTitleSafe( $targetNs, $foreignTitle->getText() );
+		}
+
+		// Otherwise, just fall back to main namespace
+		return Title::makeTitleSafe( 0, $foreignTitle->getFullText() );
+	}
+}