[1] Geography Markup Language (GML) simple features profile http://portal.opengeospatial.org/files/?artifact_id=15201

ows:Parameter name="outputFormat" 
   ows:Valuetext/xml; subType=gml/3.1.1</ows:Value> 
   ows:Valuetext/xml; subType=gml/3.1.1/profiles/gmlsf/1.0.0/0</Value> 
   ows:Valuetext/xml; subType=gml/3.1.1/profiles/gmlsf/1.0.0/1</Value> 
</ows:Parameter>