GML

El GML (Geography Markup Language) es una codificación basada en XML, pensada para la descarga, transporte , almacenaje y intercambio, de la información geográfica sobre Internet, pero no de presentación final.

GML contempla la descripción de entidades geométricas y topológicas así como sus relaciones y atributos alfanuméricos mediante esquemas XML (XSD).

Esto permite a cada usuario o institución crear sus propios esquemas para describir de forma compleja objetos geográficos para después poderla compartir o vincular con otros esquemas

Se puede ver la especificación en https://www.ogc.org/standards/gml

<?xml version="1.0" encoding="utf-8"?>
<!--Parcela Catastral de la D.G. del Catastro.-->
<!--La precisión es la que corresponde nominalmente a la escala de captura de la cartografía-->
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<member>
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<cp:areaValue uom="m2">1978612</cp:areaValue>
<cp:beginLifespanVersion>2011-05-31T00:00:00</cp:beginLifespanVersion>
<cp:endLifespanVersion xsi:nil="true" nilReason="http://inspire.ec.europa.eu/codelist/VoidReasonValue/Unpopulated"></cp:endLifespanVersion>
<cp:geometry>
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          <gml:posList srsDimension="2" count="25">425527.13 4594340.22 425612.61 4594438.61 425578.76 4594484.34 425569.02 4594466.89 425516.34 4594372.51 425513.75 4594373.84 425512.18 4594371.6 425510.79 4594369.27 425510.25 4594368.26 425509.79 4594367.01 425509.6 4594366.22 425509.52 4594365.71 425509.45 4594364.38 425509.49 4594362.47 425509.72 4594360.57 425509.8 4594360.19 425510.16 4594358.71 425510.81 4594356.81 425511.52 4594355.22 425511.64 4594354.99 425512.65 4594353.25 425513.25 4594352.55 425513.78 4594351.92 425524.73 4594342.32 425527.13 4594340.22</gml:posList>
      </gml:LinearRing>
  </gml:interior>
  <gml:interior>
      <gml:LinearRing>
          <gml:posList srsDimension="2" count="8">425908.55 4594760.46 425824.5 4594834.58 425804.49 4594811.89 425804.73 4594808.38 425887.23 4594736.14 425888.74 4594737.57 425904.41 4594755.64 425908.55 4594760.46</gml:posList>
      </gml:LinearRing>
  </gml:interior>
  </gml:PolygonPatch>
  </gml:patches>
  </gml:Surface>
  </gml:surfaceMember>
</gml:MultiSurface>
</cp:geometry>
<cp:inspireId>
<Identifier xmlns="http://inspire.ec.europa.eu/schemas/base/3.3">
  <localId>5049611DF2954G</localId>
  <namespace>ES.SDGC.CP</namespace>
</Identifier>
</cp:inspireId>
<cp:label>11</cp:label>
<cp:nationalCadastralReference>5049611DF2954G</cp:nationalCadastralReference>
<cp:referencePoint>
<gml:Point gml:id="ReferencePoint_ES.SDGC.CP.5049611DF2954G" srsName="http://www.opengis.net/def/crs/EPSG/0/25831">
  <gml:pos>425003.4 4594786.65</gml:pos>
</gml:Point>
</cp:referencePoint>
</cp:CadastralParcel>
</member>
</FeatureCollection>

Ejemplo

Descargar el GML de una parcela de catastro desde el [visor]https://www1.sedecatastro.gob.es/Cartografia/mapa.aspx de la Sede Electrónica del Catastro