[Geoserver-users] Unable to use GML files as Datastores

Simon_Janssens1 · March 17, 2009, 1:43pm

Dear all,

I’ll try to use gml files as Datastores but it’s not working…
A simple file (see below) failed with a TimeOut…

<?xml version="1.0" encoding="UTF-8"?>

<gml:Null xmlns:gml=“http://www.opengis.net/gml” xmlns:sch=“http://www.ascc.net/xml/schematron” xmlns:xlink=“http://www.w3.org/1999/xlink” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation="http://www.opengis.net/gml

http://localhost:8080/geoserver/schemas/gml/3.1.1/base/gml.xsd"/>

With a more complex file (see below), geoserver throw an null pointer exception for the method getTypeNames(FileGMLDataStore.java:104)

<?xml version="1.0" encoding="UTF-8"?>

<gml:FeatureCollection xmlns:gml=“http://www.opengis.net/gml” xmlns:sch=“http://www.ascc.net/xml/schematron” xmlns:xlink=“http://www.w3.org/1999/xlink” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation="http://www.opengis.net/gml

http://localhost:8080/geoserver/schemas/gml/3.1.1/base/gml.xsd">
gml:boundedBy
gml:Envelope
gml:lowerCorner0 0</gml:lowerCorner>
gml:upperCorner500 500</gml:upperCorner>
</gml:Envelope>
</gml:boundedBy>
gml:featureMember
gml:Observation
gml:validTime/
gml:target
gml:Polygon
gml:outerBoundaryIs
gml:LinearRing
gml:coordinates0,0 100,0 100,100 0,100 0,0</gml:coordinates>
</gml:LinearRing>
</gml:outerBoundaryIs>
</gml:Polygon>
</gml:target>
gml:resultOf/
</gml:Observation>
</gml:featureMember>
</gml:FeatureCollection>

I know that GML isn’t the best chooise with regards to the speed but I only have this kind of file as input…

What’s wrong with the GML datastore??? or with MY GML files???

WKR

Simon

Justin_Deoliveira · March 17, 2009, 2:57pm

Hi Simon,

Unfortunately the GML data store in GeoServer is quite poorly maintained. Saying it "works" is a stretch, which is why we don't ship with it directly.

That said, one thing to note is that it only does gml2, not gml3 which is specified below. I also notice that your polygon is specified in gml2 but the document is gml3.

-Justin

Simon Janssens wrote:

Dear all,

I'll try to use gml files as Datastores but it's not working....
A simple file (see below) failed with a TimeOut...

      <?xml version="1.0" encoding="UTF-8"?>
      <gml:Null xmlns:gml="http://www.opengis.net/gml"
      xmlns:sch="http://www.ascc.net/xml/schematron"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.opengis.net/gml

      http://localhost:8080/geoserver/schemas/gml/3.1.1/base/gml.xsd"/>

With a more complex file (see below), geoserver throw an null pointer exception for the method getTypeNames(FileGMLDataStore.java:104)

      <?xml version="1.0" encoding="UTF-8"?>
      <gml:FeatureCollection xmlns:gml="http://www.opengis.net/gml"
      xmlns:sch="http://www.ascc.net/xml/schematron"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.opengis.net/gml

      http://localhost:8080/geoserver/schemas/gml/3.1.1/base/gml.xsd">
              <gml:boundedBy>
                      <gml:Envelope>
                              <gml:lowerCorner>0 0</gml:lowerCorner>
                              <gml:upperCorner>500 500</gml:upperCorner>
                      </gml:Envelope>
              </gml:boundedBy>
              <gml:featureMember>
                      <gml:Observation>
                              <gml:validTime/>
                              <gml:target>
                                      <gml:Polygon>
                                              <gml:outerBoundaryIs>
                                                      <gml:LinearRing>
                                                                   <gml:coordinates>0,0 100,0 100,100 0,100 0,0</gml:coordinates>
                                                      </gml:LinearRing>
                                              </gml:outerBoundaryIs>
                                      </gml:Polygon>
                              </gml:target>
                              <gml:resultOf/>
                      </gml:Observation>
              </gml:featureMember>
      </gml:FeatureCollection>

I know that GML isn't the best chooise with regards to the speed but I only have this kind of file as input....

What's wrong with the GML datastore??? or with MY GML files???

WKR

Simon

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Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.