[gdal-dev] ogr2ogr 1.9 gml3.2 output and multisurface

[Gordon Tisher]

Hi,

I have a question regarding GML3.2 output from ogr2ogr in GDAL 1.9 (from
a daily build from a few days ago).  I have a sample shapefile (found at
http://www.vdstech.com/mapdata/canada.zip) that I've tried to convert to
GML 3.2 using the command "ogr2ogr -f GML canada.xml canada.shp -dsco
FORMAT=GML3.2".

When I try to validate the resulting file (using xerces via the oXygen
editor, as well as the .NET xml schema libraries) there are a couple of
problems:

 - The XML file sometimes includes the element gml:MultiSurface in the
element ogr:geometryProperty, which the XML 3.2.1 schema does not allow,
as ogr:geometryProperty is defined in the generated XSD file to be of
type gml:SurfacePropertyType, which only allows elements in the
substitution group gml:AbstractSurface.  gml:MultiSurface is not in that
group.

 - Inside the gml:MultiSurface elements, the individual gml:Polygon
elements do not have id attributes, which xerces complains about.

Perhaps the type of the generated gml:geometryProperty element should be
gml:GeometryPropertyType, which allows child elements of anything in the
gml:AbstractGeometry substitution group, and contains all the other
attributes that are found in gml:SurfacePropertyType.

Am I missing something here?

Thanks,

-- 
Gordon Tisher                                   gtisher at sydneyplus.com
Software Engineer                                      +1 604-278-9161
SydneyPLUS             5138 - 13562 Maycrest Way, Richmond, BC V6V 2J7