def object(self) :
"""Gets the y in xRy as a blob."""
if self._object == None :
self._object = models.get_by_uuid(self.payload_parts[1])
return self._object
def subject(self) :
"""Gets the x in xRy as a blob."""
if self._subject == None :
self._subject = models.get_by_uuid(self.payload_parts[0])
return self._subject