@abc.abstractmethod<EOL><INDENT>def set_url(self, url):<DEDENT>
pass<EOL>
Sets the url.

        :param url: the new url
        :type url: ``string``
        :raise: ``InvalidArgument`` -- ``url`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``
        :raise: ``NullArgument`` -- ``url`` is ``null``

        *compliance: mandatory -- This method must be implemented.*