public function getContents()
 {
     $parser = new Zend_Tool_Project_Structure_Parser_Xml();
     $isTraverseEnabled = Zend_Tool_Project_Structure_Graph::isTraverseEnabled();
     Zend_Tool_Project_Structure_Graph::setTraverseEnabled(true);
     $xml = $parser->serialize($this->_graph);
     Zend_Tool_Project_Structure_Graph::setTraverseEnabled($isTraverseEnabled);
     return $xml;
 }