@classmethod
def existing(cls, **kwargs):
    """Create an instance of an existing remote resource.

        When creating the instance set the ``_synchronized`` parameter
        of :class:`Resource` to ``True`` to indicate that it represents the
        state of an existing server-side resource. As such, all attributes
        passed in ``**kwargs`` are considered "clean", such that an immediate
        :meth:`update` call would not generate a body of attributes to be
        modified on the server.

        :param dict kwargs: Each of the named arguments will be set as
                            attributes on the resulting Resource object.
        """
    return cls(_synchronized=True, **kwargs)
