@property
    def md_until(self):
        if ('md_until' in self.md):
            return(self.md['md_until'])
        else:
            return(None)
Invokes the :class:`Session.update_or_create` method.
dataset/ETHPy150Open resync/resync/resync/resource_container.py/ResourceContainer.md_until--crossover with--dataset/ETHPy150Open lsbardel/python-stdnet/stdnet/odm/session.py/Manager.update_or_create