'Applies sub-filter to the correlated value maps.
The default implementation matches when any value_map in value_maps
matches the sub-filter.
Args:
value_maps: A list of correlated value_maps.
Returns:
True if any the entity matches the correlation filter.'

def _apply_correlated(self, value_maps):

    for map in value_maps:
        if self._subfilter._apply(map):
            return True
    return False
