Default GML links in Layer Preview page do not work for app-schema layers

The default GML link generated by the layer preview page uses WFS 1.0.0 as protocol and GML2 as output format, but this does not work for app-schema layers, since GML2 does not support complex features at all.

Clicking on the link results in a ServiceException response with the following error message:

java.lang.ClassCastException: org.geotools.feature.type.ComplexFeatureTypeImpl cannot be cast to org.opengis.feature.simple.SimpleFeatureType org.geotools.feature.type.ComplexFeatureTypeImpl cannot be cast to org.opengis.feature.simple.SimpleFeatureType

Ideally, the generated GML link for app-schema layers should:

• use WFS 1.1.0 as protocol
• use either GML 3.1.1 or GML 3.2 as output format, depending on the schema
• use the global OWS service instead of virtual services, to avoid problems accessing secondary namespaces