How can I check in QGIS whether a GML file has elevation information, or z coordinates?
It definitely has some overlapping polygons, but I'm not sure whether the ordering of the overlap is specified or not.
The easiest way is to look at the
poslist elements to see what the srsDimension attribute is - the default is 2 if it is missing.
<gml:pos srsDimension="2">45.67 88.56</gml:pos> <gml:posList srsDimension="2">45.67 88.56 55.56 89.44</gml:posList>