$wgParser->startExternalParse( $title_obj, $options, Parser::OT_PREPROCESS );
$dom = $wgParser->preprocessToDom( $params['text'] );
if ( is_callable( array( $dom, 'saveXML' ) ) ) {
$wgParser->startExternalParse( $title_obj, $options, Parser::OT_PREPROCESS );
$dom = $wgParser->preprocessToDom( $params['text'] );
if ( is_callable( array( $dom, 'saveXML' ) ) ) {