/**
* Export to xml-rdf the ontology of the Class in parameter.
* All the ontologies are exported if the class is not set
*
* @access public
* @author Jerome Bogaerts, <*****@*****.**>
* @param Class source
* @return string
*/
public function export(core_kernel_classes_Class $source = null)
{
$rdf = '';
if (is_null($source)) {
return core_kernel_api_ModelExporter::exportAll();
}
$graph = new EasyRdf_Graph();
if ($source->isClass()) {
$this->addClass($graph, $source);
} else {
$this->addResource($graph, $source);
}
$format = EasyRdf_Format::getFormat('rdfxml');
return $graph->serialise($format);
}
