protected function create_regObjects()
    {
        $this->working_node = $this->oai_pmh->addChild($this->working_node, 'lom:lom');
        $this->working_node->setAttribute('xmlns:lom', "http://ltsc.ieee.org/xsd/LOM");
        $this->working_node->setAttribute('xmlns:dc', "http://purl.org/dc/elements/1.1/");
    }