@ignore
protected function reify($t, $s, $p, $o, $sType, $oType, $oDatatype = null, $oLang = null) {
$this
->add($t, $this->rdf . 'type', $this->rdf . 'Statement', 'uri', 'uri');
$this
->add($t, $this->rdf . 'subject', $s, 'uri', $sType);
$this
->add($t, $this->rdf . 'predicate', $p, 'uri', 'uri');
$this
->add($t, $this->rdf . 'object', $o, 'uri', $oType, $oDatatype, $oLang);
}