/**
  * 
  * 
  * @author Frederick Giasson, Structured Dynamics LLC.
  */
 public function deleteOntology()
 {
     if ($this->isValid()) {
         $this->initiateOwlBridgeSession();
         $this->getOntologyReference();
         // Delete the OWLAPI instance
         if ($this->ws->ontology) {
             $this->ws->ontology->delete();
         }
         // Remove the holdOntology tag before deleting the ontology
         $query = "delete data from <" . $this->ws->wsf_graph . "datasets/>\n                {\n                  <" . $this->ws->ontologyUri . "> <http://purl.org/ontology/wsf#holdOntology> \"true\" .\n                }";
         @$this->ws->db->query($this->ws->db->build_sparql_query(str_replace(array("\n", "\r", "\t"), " ", $query), array(), FALSE));
         // Check to delete potential datasets that have been created within structWSF
         $datasetDelete = new DatasetDelete($this->ws->ontologyUri, $this->ws->registered_ip, $this->ws->requester_ip);
         $datasetDelete->ws_conneg($_SERVER['HTTP_ACCEPT'], $_SERVER['HTTP_ACCEPT_CHARSET'], $_SERVER['HTTP_ACCEPT_ENCODING'], $_SERVER['HTTP_ACCEPT_LANGUAGE']);
         $datasetDelete->process();
         if ($datasetDelete->pipeline_getResponseHeaderStatus() != 200) {
             $this->ws->conneg->setStatus($datasetDelete->pipeline_getResponseHeaderStatus());
             $this->ws->conneg->setStatusMsg($datasetDelete->pipeline_getResponseHeaderStatusMsg());
             $this->ws->conneg->setStatusMsgExt($datasetDelete->pipeline_getResponseHeaderStatusMsgExt());
             $this->ws->conneg->setError($datasetDelete->pipeline_getError()->id, $datasetDelete->pipeline_getError()->webservice, $datasetDelete->pipeline_getError()->name, $datasetDelete->pipeline_getError()->description, $datasetDelete->pipeline_getError()->debugInfo, $datasetDelete->pipeline_getError()->level);
             return;
         }
     }
 }