[gdal-dev] GML (created via ogr2ogr) validation with OpenGIS XSD

[Jonathan Beliën]

Hi Even,

Thanks a lot for quick and detailed answer.
So simple I didn't thought about it ... what an idiot !

Subsidiary questions : how can I validate my GML file to be sure there is only Simple Features (like no self-intersection for instance) ?

Thanks a lot for your help.

PS: I use xmllint to validate my GML files.

Jonathan Beliën
GEO-6


-----Message d'origine-----
De : Even Rouault [mailto:even.rouault at spatialys.com] 
Envoyé : lundi 4 juillet 2016 20:10
À : gdal-dev at lists.osgeo.org
Cc : Jonathan Beliën
Objet : Re: [gdal-dev] GML (created via ogr2ogr) validation with OpenGIS XSD

Le lundi 04 juillet 2016 17:04:53, Jonathan Beliën a écrit :
> Hi everyone,
> 
> 
> 
> I’m trying to validate a GML file produced with ogr2ogr with OpenGIS 
> GML XSD files.
> 
> 
> 
> For every file I try to validate I have the same error message : « 
> element
> FeatureCollection: Schemas validity error : Element
> '{http://ogr.maptools.org/}FeatureCollection': No matching global 
> declaration available for the validation root. »
> 
> 
> 
> I suspect I do something wrong but I can’t figure what !?!

As far as I know, files produces with OGR GML driver validate against the schemas. You didn't specify which tool you used to do the validation and how do you invoked it.

You must validate explictly against the .xsd file generated along side of the .gml. This xsd will import the appropriate GML schemas.

Example of successful validation with xmllint/libxml2 :

$ ogr2ogr -f GML poly.gml poly.shp

$ xmllint -noout -schema poly.xsd poly.gml poly.gml validates

$ ogr2ogr -f GML poly.gml poly.shp -dsco FORMAT=GML3

$ xmllint -noout -schema poly.xsd poly.gml poly.gml validates


> 
> 
> 
> I tried several -dsco FORMAT parameter and tried to validate on every 
> schema I could find here http://schemas.opengis.net/gml/ without any 
> success.
> 
> 
> 
> Does someone know what I’m doing wrong or could help me to validate my 
> file ?
> 
> 
> 
> Thanks a lot !
> 
> 
> 
> Copy of my test file :
> 
> 
> 
> <?xml version="1.0" encoding="utf-8" ?>
> 
> <ogr:FeatureCollection
> 
>      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> 
>      xsi:schemaLocation="http://ogr.maptools.org/ test.xsd"
> 
>      xmlns:ogr="http://ogr.maptools.org/"
> 
>      xmlns:gml="http://www.opengis.net/gml">
> 
>   <gml:boundedBy>
> 
>     <gml:Box>
> 
> 
> <gml:coord><gml:X>3.38653564453125</gml:X><gml:Y>50.41551870402676</gm
> l:Y><
> / gml:coord>
> 
> 
> <gml:coord><gml:X>4.57305908203125</gml:X><gml:Y>50.89956852220873</gm
> l:Y><
> / gml:coord>
> 
>     </gml:Box>
> 
>   </gml:boundedBy>
> 
> 
> 
> 
>   <gml:featureMember>
> 
>     <ogr:test fid="test.0">
> 
>       <ogr:geometryProperty><gml:Polygon
> srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordina
> tes>4 . 49066162109375,50.896103955543587 
> 3.38653564453125,50.60415948856101
> 4.57305908203125,50.415518704026759 
> 3.61724853515625,50.899568522208732
> 4.49066162109375,50.896103955543587</gml:coordinates></gml:LinearRing>
> </gm
> l: outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
> 
>       <ogr:userid>userid-1</ogr:userid>
> 
>     </ogr:test>
> 
>   </gml:featureMember>
> 
>   <gml:featureMember>
> 
>     <ogr:test fid="test.1">
> 
>       <ogr:geometryProperty><gml:MultiPolygon
> srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundary
> Is><g m 
> l:LinearRing><gml:coordinates>3.921339446183916,50.745568181163129
> 4.57305908203125,50.415518704026759 3.38653564453125,50.60415948856101
> 3.921339446183916,50.745568181163129</gml:coordinates></gml:LinearRing
> ></g
> ml
> 
> :outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:
> :P
> 
> olygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4.4906616
> olygon>21093
> 7 5,50.896103955543587 3.921339446183916,50.745568181163129
> 3.61724853515625,50.899568522208732
> 4.49066162109375,50.896103955543587</gml:coordinates></gml:LinearRing>
> </gml
> :
> outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon><
> outerBoundaryIs>/ogr
> :g eometryProperty>
> 
>       <ogr:label>label-2</ogr:label>
> 
>     </ogr:test>
> 
>   </gml:featureMember>
> 
> </ogr:FeatureCollection>
> 
> 
> 
> Jonathan Beliën
> 
> GEO-6

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