/** @return PntClassDescriptor the descriptor of the class of the requested object,
	 * 	or null if none.
	 * Includes the class from the domain folder.
	 */
	function getTypeClassDescriptor() {
		$type = $this->getType();
		$usable = $this->useClass($type, $this->getDomainDir());
		
		return PntClassDescriptor::getInstance($type);
	}