static function get_extrif_to_html_transformer() { if (is_null(self::$extrif_to_html_transformer)) { $extRifToHtml = new DomDocument(); $extRifToHtml->load(REGISTRY_APP_PATH . 'registry_object/transforms/extrif_to_html.xsl'); $extRifToHtmlproc = new XSLTProcessor(); $extRifToHtmlproc->importStyleSheet($extRifToHtml); self::$extrif_to_html_transformer = $extRifToHtmlproc; } return self::$extrif_to_html_transformer; }