@classmethod<EOL><INDENT>def key_for_namespace(cls, namespace):<DEDENT>
if namespace:<EOL><INDENT>return model.Key(cls.KIND_NAME, namespace)<EOL><DEDENT>else:<EOL><INDENT>return model.Key(cls.KIND_NAME, cls.EMPTY_NAMESPACE_ID)<EOL><DEDENT>
Return the Key for a namespace.

        Args:
          namespace: A string giving the namespace whose key is requested.

        Returns:
          The Key for the namespace.