UpdateRefs.
        Creating, updating, or deleting refs(branches).
        :param [GitRefUpdate] ref_updates: List of ref updates to attempt to perform
        :param str repository_id: The name or ID of the repository.
        :param str project: Project ID or project name
        :param str project_id: ID or name of the team project. Optional if specifying an ID for repository.
        :rtype: [GitRefUpdateResult]

def update_refs(self, ref_updates, repository_id, project=None, project_id=None):
        """UpdateRefs.
        Creating, updating, or deleting refs(branches).
        :param [GitRefUpdate] ref_updates: List of ref updates to attempt to perform
        :param str repository_id: The name or ID of the repository.
        :param str project: Project ID or project name
        :param str project_id: ID or name of the team project. Optional if specifying an ID for repository.
        :rtype: [GitRefUpdateResult]
        """
        route_values = {}
        if project is not None:
            route_values['project'] = self._serialize.url('project', project, 'str')
        if repository_id is not None:
            route_values['repositoryId'] = self._serialize.url('repository_id', repository_id, 'str')
        query_parameters = {}
        if project_id is not None:
            query_parameters['projectId'] = self._serialize.query('project_id', project_id, 'str')
        content = self._serialize.body(ref_updates, '[GitRefUpdate]')
        response = self._send(http_method='POST',
                              location_id='2d874a60-a811-4f62-9c9f-963a6ea0a55b',
                              version='5.0',
                              route_values=route_values,
                              query_parameters=query_parameters,
                              content=content)
        return self._deserialize('[GitRefUpdateResult]', self._unwrap_collection(response))