I don't get why srsName is mandatory for geometry collections but optional for geometries in GML 2. In WFS 1.0.0, srsName cannot be specified with the request (although GeoServer handles this as vendor param). In WFS 1.1.0, srsName can be specified with the request. If they mean "WFS" with the interface and "GML" with the payload in that policy, it is still not defined whether the interface or the payload takes precedence. Assuming that the server respects the srsName specified with a WFS 1.1.0 request, the srsName of the returned GML payload should be the same, in which case case 1 of that policy would apply. For WFS 1.0.0, the policy would apply whenever srsName is specified for simple geometries, and always for geometry collections. This is clearly not the case with the topp-states WFS 1.0.0 example data.