def delete(self, name):
        """
        Delete the specified entry if it exists.
        """
        if isinstance(name, (list, tuple)):
            for xx in name:
                self.delete(xx)
        else:
            if name in self._record_map:
                del self._record_map[name]
                self._record_list = [
                    r for r in self._record_list if r['name'] != name]
Delete the specified entry if it exists.