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diff --git a/includes/title/NamespaceAwareForeignTitleFactory.php b/includes/title/NamespaceAwareForeignTitleFactory.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, using information about the namespace setup on the foreign site.
+ */
+class NamespaceAwareForeignTitleFactory implements ForeignTitleFactory {
+	/**
+	 * @var array
+	 */
+	protected $foreignNamespaces;
+	/**
+	 * @var array
+	 */
+	private $foreignNamespacesFlipped;
+
+	/**
+	 * Normalizes an array name for $foreignNamespacesFlipped.
+	 * @param string $name
+	 * @return string
+	 */
+	private function normalizeNamespaceName( $name ) {
+		return strtolower( str_replace( ' ', '_', $name ) );
+	}
+
+	/**
+	 * @param array|null $foreignNamespaces An array 'id' => 'name' which contains
+	 * the complete namespace setup of the foreign wiki. Such data could be
+	 * obtained from siteinfo/namespaces in an XML dump file, or by an action API
+	 * query such as api.php?action=query&meta=siteinfo&siprop=namespaces. If
+	 * this data is unavailable, use NaiveForeignTitleFactory instead.
+	 */
+	public function __construct( $foreignNamespaces ) {
+		$this->foreignNamespaces = $foreignNamespaces;
+		if ( !is_null( $foreignNamespaces ) ) {
+			$this->foreignNamespacesFlipped = array();
+			foreach ( $foreignNamespaces as $id => $name ) {
+				$newKey = self::normalizeNamespaceName( $name );
+				$this->foreignNamespacesFlipped[$newKey] = $id;
+			}
+		}
+	}
+
+	/**
+	 * 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 ) {
+		// 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 ( is_null( $ns ) ) {
+			return self::parseTitleNoNs( $title );
+		} else {
+			return self::parseTitleWithNs( $title, $ns );
+		}
+	}
+
+	/**
+	 * Helper function to parse the title when the namespace ID is not specified.
+	 *
+	 * @param string $title
+	 * @return ForeignTitle
+	 */
+	protected function parseTitleNoNs( $title ) {
+		$pieces = explode( ':', $title, 2 );
+		$key = self::normalizeNamespaceName( $pieces[0] );
+
+		// Does the part before the colon match a known namespace? Check the
+		// foreign namespaces
+		$isNamespacePartValid = isset( $this->foreignNamespacesFlipped[$key] );
+
+		if ( count( $pieces ) === 2 && $isNamespacePartValid ) {
+			list( $namespaceName, $pageName ) = $pieces;
+			$ns = $this->foreignNamespacesFlipped[$key];
+		} else {
+			$namespaceName = '';
+			$pageName = $title;
+			$ns = 0;
+		}
+
+		return new ForeignTitle( $ns, $namespaceName, $pageName );
+	}
+
+	/**
+	 * Helper function to parse the title when the namespace value is known.
+	 *
+	 * @param string $title
+	 * @param int $ns
+	 * @return ForeignTitle
+	 */
+	protected function parseTitleWithNs( $title, $ns ) {
+		$pieces = explode( ':', $title, 2 );
+
+		if ( isset( $this->foreignNamespaces[$ns] ) ) {
+			$namespaceName = $this->foreignNamespaces[$ns];
+		} else {
+			$namespaceName = $ns == '0' ? '' : $pieces[0];
+		}
+
+		// We assume that the portion of the page title before the colon is the
+		// namespace name, except in the case of namespace 0
+		if ( $ns != '0' ) {
+			$pageName = $pieces[1];
+		} else {
+			$pageName = $title;
+		}
+
+		return new ForeignTitle( $ns, $namespaceName, $pageName );
+	}
+}