def __is_link(self, value): return isinstance(value, string_types) and is_resource_url(value)
def _is_link_node(self, node, attr): # pylint: disable=W0613 return isinstance(node, string_types) and is_resource_url(node)
def __is_link(self, value): return isinstance(value, basestring) and is_resource_url(value)