<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def generate_ref(self):
 """ Ref can be link to remote or local definition. .. code-block:: python {'$ref': 'http://json-schema.org/draft-04/schema#'} { 'properties': { 'foo': {'type': 'integer'}, 'bar': {'$ref': '#/properties/foo'} } } """

        with self._resolver.in_scope(self._definition['$ref']):
            name = self._resolver.get_scope_name()
            uri = self._resolver.get_uri()
            if uri not in self._validation_functions_done:
                self._needed_validation_functions[uri] = name
            # call validation function
            self.l('{}({variable})', name)