<gml:GeometryCollection xmlns:gml="http://www.opengis.net/gml" srsName="foo">
    <gml:geometryMember>
        <gml:Point srsName="foo">
          <gml:coordinates decimal="." cs="," ts=" ">1,2</gml:coordinates>
        </gml:Point>
    </gml:geometryMember>
    <gml:geometryMember>
        <gml:LineString srsName="foo">
          <gml:coordinates decimal="." cs="," ts=" ">1,2 3,4</gml:coordinates>
        </gml:LineString>
    </gml:geometryMember>
    <gml:geometryMember>
        <gml:Polygon srsName="foo">
            <gml:outerBoundaryIs>
                <gml:LinearRing>
                    <gml:coordinates decimal="." cs="," ts=" ">1,2 3,4 5,6 1,2</gml:coordinates>
                </gml:LinearRing>
            </gml:outerBoundaryIs>
            <gml:innerBoundaryIs>
                <gml:LinearRing>
                    <gml:coordinates decimal="." cs="," ts=" ">2,3 4,5 6,7 2,3</gml:coordinates>
                </gml:LinearRing>
            </gml:innerBoundaryIs>    
            <gml:innerBoundaryIs>
                <gml:LinearRing>
                    <gml:coordinates decimal="." cs="," ts=" ">3,4 5,6 7,8 3,4</gml:coordinates>
                </gml:LinearRing>
            </gml:innerBoundaryIs>    
        </gml:Polygon>
    </gml:geometryMember>
</gml:GeometryCollection>
