Mapping DCAT

Cleanup

Combine all XSLT producing RDF in order to have same output as former rdf.search service and CSW responses - trying to get last changes mainly made by @pvgenuchten.

CSW response was not containing referenced elements in response eg. Distribution, Concept, Org (maybe done on purpose?). Cf. #1407

eg.

• v3 / rdf.search
  https://vanilla.geocat.net/geonetwork/srv/eng/rdf.search?uuid=da165110-88fd-11da-a88f-000d939bc5d8

• v3-v4 / CSW
  https://vanilla.geocat.net/geonetwork/srv/eng/csw?SERVICE=CSW&VERSION=2.0.2&REQUEST=GetRecordById&outputSchema=http://www.w3.org/ns/dcat%23&ID=da165110-88fd-11da-a88f-000d939bc5d8

Use Anchor for thesaurus and keywords

As we have Anchor support, use xlink:href when set on thesaurus and keywords. URI will point to registry applications (eg. Vocprez, R3gistry, LD-Registry) when defined and makes more sense than building custom internal URI.

ISO 19115-3 / CSW / Add support for DCAT output

Rely on the old 2012 ISO19139 mapping.

Test: Load an ISO19115-3 record eg. https://metawal.wallonie.be/geonetwork/srv/api/records/ea5f844f-2d61-4472-a75c-5fe7f322c123/formatters/xml then query using CSW http://localhost:8080/geonetwork/srv/eng/csw?SERVICE=CSW&VERSION=2.0.2&REQUEST=GetRecordById&ID=ea5f844f-2d61-4472-a75c-5fe7f322c123&outputSchema=http%3A%2F%2Fwww.w3.org%2Fns%2Fdcat%23&elementSetName=full

Using OGC API Records https://github.com/geonetwork/geonetwork-microservices/tree/main/modules/services/ogc-api-records is preferred. eg https://sextant.ifremer.fr/geonetwork/api/collections/main/items/e522f0b5-f090-40ea-8189-188be4e9849c?f=dcat

Main idea here is to avoid CSW errors in case of GetRecords query on catalogue mixing ISO19139 and 19115-3. BTW dublin core or ISO19110 have no mapping so may trigger exception. Filtering by documentStandard may still be required

<?xml version="1.0"?>
<csw:GetRecords xmlns:csw="http://www.opengis.net/cat/csw/2.0.2"
                xmlns:gmd="http://www.isotc211.org/2005/gmd"
                service="CSW" version="2.0.2"
                resultType="results"
                outputSchema="http://www.w3.org/ns/dcat#">
  <csw:Query typeNames="gmd:MD_Metadata">
    <csw:ElementSetName>full</csw:ElementSetName>
    <csw:Constraint version="1.1.0">
      <Filter xmlns="http://www.opengis.net/ogc">
        <PropertyIsEqualTo>
          <PropertyName>documentStandard</PropertyName>
          <Literal>iso19139</Literal>
        </PropertyIsEqualTo>
      </Filter>
    </csw:Constraint>
  </csw:Query>
</csw:GetRecords>

Future work

• Maybe add a conversion for dublin-core records ?