[gdal-dev] Writing a GML file containing multiple layers

[Matt L]

Hi Everyone,

I am attempting to use ogr2ogr to convert GeoJSON to GML. It works well for
a single json file. But I would like to convert several files, such that
each input file ends up as a separate layer in a single GML output file.

The GML help doc seems to suggest that GML can be written with multiple
layers - i.e. "On export all layers are written to a single GML file all in
a single feature collection. Each layer's name is used as the element name
for objects from that layer."

I tired at first by simply adding additional json files to the command line
:

ogr2ogr -f GML output.gml roads.json buildings.json

But this fails with the error :

"FAILURE: Couldn't fetch requested layer 'buildings.json'!"

(this is a valid file by the way - and can be converted on it's own).

Can anyone shed any light on this? Is it possible to write multiple layers
(for example, from an input file representing roads, and an input file
representing buildings) to a GML file using ogr2ogr? If not, can this be
done in code somehow?

Any help greatly appreciated.

Regards,
Matt



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