/**
* query the object with path and query parameters from Xapp_Util_Json_Query::find method and use store
* methods on search result, e.g.
* <code>
* $store = Xapp_Util_Json_Store::create($object)
->query('/firstElement', array("id=1000"))
->query('.', array('title=foo'))
->set(null, 1);
* </code>
*
* the query method must be terminated with a store method!
*
* @see Xapp_Util_Std_Query::find
* @error 17005
* @param string $path expects the optional search path as outlined above
* @param array $query expects the optional query filter chain as explained above
* @param null|string $result_flag expects optional result flag "first" or "last"
* @return $this
*/
public function query($path, array $query = null, $result_flag = 'first')
{
$this->_result =& Xapp_Util_Json_Query::find($this->_object, $path, $query, $result_flag);
return $this;
}