public function getArchivename($revision)
	{
		// Obtain the properties of the revision
		if (($info = $this->getRevision($revision)) === null) {
			return null;
		}

		// Check for archive name
		if (!isset($info['archivename'])) {
			// Return error message
			$this->error = array();
			$this->error['file'] = 'This revision contains no archive name';
			return null;
		}

		return $info['archivename'];
	}