Purpose and usage

This XSLT is a proof of concept for the RDF representation of the OGC EPSG register of coordinate reference systems, extending the RDF mappings for reference systems defined in GeoDCAT-AP, the geospatial profile of DCAT-AP available on Joinup, the collaboration platform of the EU ISA² Programme:

https://joinup.ec.europa.eu/solution/geodcat-ap

As such, this XSLT must be considered as unstable, and can be updated any time based on the revisions to the GeoDCAT-AP specifications and related work in the framework of the EU ISA² Programme.

Comments and inquiries should be sent via the issue tracker.

Content

epsg-to-rdf.xsl: The code of the XSLT.
examples/: Folder containing examples of the RDF representation generated by the XSLT.
LICENCE.md: The XSLT's licence.
README.md: This document.

Implemented mappings

The OGC EPSG register is typed as a skos:ConceptScheme, with each CRS linked via the skos:hasTopConcept property.
Each CRS is typed both as a skos:Concept and a dct:Standard, with skos:inScheme and skos:topConceptOf properties pointing to the OGC EPSG register. The fact that the entry is about a CRS is specified by using property dct:type, which takes as value the URI from the INSPIRE Glossary for spatial reference systems.

XPath	RDF property path
`gml:identifier`	`dct:identifier` + `skos:notation`
`gml:name`	`dct:title` + `skos:prefLabel`
`gml:remarks`	`rdfs:comment`
`gml:scope`	`skos:scopeNote`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:alias` / `epsg:remarks`	`rdfs:comment`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:changes` / `*`	`skos:changeNote`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:informationSource`	`dc:source`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:isDeprecated`	`owl:deprecated`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:revisionDate`	`dct:modified`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:type`	`dc:type`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:Usage` / `gml:extent`	`dct:spatial`
`gml:metaDataProperty` / `epsg:CommonMetaData` / `epsg:Usage` / `gml:scope`	`skos:scopeNote`
`epsg:AreaOfUse` / `gmd:description`	`dct:spatial` / `rdfs:label`
`epsg:AreaOfUse` / `gmd:geographicElement` / `gmd:EX_GeographicBoundingBox`	`dct:spatial` / `dcat:bbox`
`gml:metaDataProperty` / `epsg:CRSMetaData` / `epsg:projectionConversion`	`prov:qualifiedDerivation` / `prov:hadActivity` / `prov:qualifiedAssociation` / `prov:hadPlan`
`gml:metaDataProperty` / `epsg:CRSMetaData` / `epsg:sourceGeographicCRS`	`prov:wasDerivedFrom`
`gml:conversion`	`prov:qualifiedDerivation` / `prov:hadActivity` / `prov:qualifiedAssociation` / `prov:hadPlan`
`gml:baseCRS` , `gml:baseGeodeticCRS` , `gml:baseGeographicCRS`	`prov:wasDerivedFrom`
`gml:ellipsoidalCS`, ... , `gml:geodeticDatum` , ...	`dct:relation`

Credits

This work was originally supported by the EU Interoperability Solutions for European Public Administrations Programme (ISA) through Action 1.17: Re-usable INSPIRE Reference Platform (ARe3NA).

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