On 05/25/2013 11:44 AM, Even Rouault wrote:
Hi Ari,
Another thing related to streaming mode.
I fail to see how below is related to streaming mode... This is a generic
behaviour of the GML driver
Because it appears when GDAL uses the DescribeFeatureType request's
output as a gfs...(?) maybe, I think :)
I was wondering why the geometries the WFS were not being parsed by the
client. It turns out that GDAL uses the tag "geometryProperty" by
default (ogrgmllayer.cpp:601). The WFS I have uses the field name from
PostGIS when replying to the DescribeFeatureType request. So I need to
add a hack to the server to always use the "geometryProperty" tag.
This seems to be a small deficiency in GDAL; that it doesn't have the
concept of a field name for geometries. This may limit the usability of
GDAL as a component of a WFS.
The issue is that, as far as I've understood, you use a schema not generated
by the GML driver with GML output generated by the GML driver.
Could the driver do it? Ok, I see InsertHeader method in
OGRGMLDataSource class, which would perhaps be the one to do it, but it
is probably not open in the bindings. Which is why I used Perl tools to
query PostGIS and reply to DescribeFeatureType request.
OGR layers have a concept of GetGeometryColumn(), in read mode. The GML driver
is able to read a GML whose geometry name is not "geometryProperty". What
could be done is to add a layer creation option to specify a geometry name
instead of the default "geometryProperty". Would you be interested in that ?
I think the right thing to do would be to open the schema methods to the
bindings. But then it would be first needed in the OGR C API. But is the
schema method a generic thing for a DataSource and thus something for
the API? Hm.
Ari
Ari
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