@classmethod
def set_default_resource_registry(cls, registry):
    """ Set the callable that will act as a default
        :term:`resource registry` for instances of the associated
        class when no ``resource_registry`` argument is provided to
        the class' constructor.  Useful when you'd like to use
        non-default requirement to resource path mappings for the
        entirety of a process.

        Calling this method resets the default :term:`resource registry`.
        """
    cls.default_resource_registry = registry
