search

GeoKnow / TripleGeo

TripleGeo utility for converting geospatial data into triples
GNU General Public License v3.0
32 stars 9 forks source link

Wrong output GML with airport example #9

Open alegrm opened 8 years ago

alegrm commented 8 years ago

Hi, I'm testing the XML transformations with GML, and I used the airport.gml file, but the output RDF has in the rdf:description all extracted points. Probably is something I should change in the xslt files?

    <?xml version="1.0" encoding="UTF-8"?>
    <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
             xmlns="http://www.opengis.net/gml/3.2"
             xmlns:xs="http://www.w3.org/TR/2008/REC-xml-20081126#"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:ogr="http://ogr.maptools.org/"
             xmlns:gml="http://www.opengis.net/gml/3.2"
             xmlns:geo="http://www.opengis.net/ont/geosparql#">
       <rdf:Description rdf:about="http://geodata.gov.gr/id/boundary/">
          <geo:asWKT rdf:datatype="http://www.opengis.net/ont/sf#wktLiteral">43463452287194963935291930</geo:asWKT>
    </rdf:Description>Bigfork Municipal Airport     47.7789    -93.6500   1343.0000Effie451306,5291930Bolduc Seaplane Base     47.5975    -93.4106   1325.0000Balsam Lake469137,5271647Bowstring Municipal Airport     47.5583    -93.8689   1372.0000Jessie Lake434634,5267578Burns Lake Seaplane Base     47.6233    -93.6103   1357.0000Clubhouse Lake454146,5274617Christenson Point Seaplane Base     47.6692    -93.0544   1372.0000Side Lake495913,5279532Deer River Municipal Airport     47.3522    -93.8000   1311.0000Deer River439581,5244617Gospel Ranch Airport     47.2289    -93.0919   1394.0000Floodwood Lake493040,5230604Grand Rapids-Itasca County/Gordon Newstrom Field     47.2108    -93.5097   1355.0000Grand Rapids461401,5228719Richter Ranch Airport     47.3161    -93.5914   1340.0000Cohasset East455305,5240463Shaughnessy Seaplane Base     47.4178    -93.3839   1300.0000Lawrence Lake West471043,5251664Sixberrys Landing Seaplane Base     47.6775    -93.0481   1372.0000Side Lake496393,5280458Snells Seaplane Base     47.6472    -93.7450   1351.0000Bigfork444049,5277360Bolduc Seaplane Base   1325.0000Tyler's Lake469000,5270000</rdf:RDF>
KostasPatroumpas commented 8 years ago

Hello and thanks for your interest in using TripleGeo.

In order to transform GML files into RDF, you should make changes at the GML2RDF.xsl stylesheet. In particular, you have to specify suitable values for all XSL variables marked with EDIT in this stylesheet, including the base URI to be used for the triples, the geospatial ontology (e.g., GeoSPARQL WKT), the tag specifying the geometry, etc.

In addition, you must pay attention to the version of the GML features, as specified in the corresponding XMLNS namespace in the header of your input (e.g., "http://www.opengis.net/gml" or "http://www.opengis.net/gml/3.2"). Make sure that you specify an identical XMLNS in the headers of both GML2RDF.xsl and GML2RDF.xsl stylesheets. This latter stylesheet is called by GML2RDF.xsl, and it is the one that actually transforms GML geometries into WKT serializations compliant with GeoSPARQL.

Once all this is properly specified, TripleGeo can readily proceed to generate the RDF triples.