/** Get the RDF serialiser object used to generate RDF data * * If no RDF Serialiser has previously been set, then a new * default (EasyRdf_Serialiser_Builtin) serialiser will be created. * * @return object mixed The RDF serialiser object */ public static function getRdfSerialiser() { if (!self::$_rdfSerialiser) { require_once "EasyRdf/Serialiser/Builtin.php"; self::$_rdfSerialiser = new EasyRdf_Serialiser_Builtin(); } return self::$_rdfSerialiser; }