Add the DCAT2 schema plugin

[jahow]

Followed instructions here: https://github.com/geonetwork/core-geonetwork/wiki/GeoNetwork-DCAT2-codesprint-April-2021#development

To do:

• make the plugin actually work
• integrate the JSON harvester work in progress to create DCAT2 records from ESRI catalogs

[jahow]

Here are the problems I encountered in my tests:

• keywords not working (no autocomplete, free text not saved)
  

• spatial and temporal extents saved but not appearing in simple view

• no validation in editor

• no multilingual validation

• no full view

• value entered in "landing page" not saved sometimes
  

• "concepts" not saved
  

• in simple view, catalog record info (title, abstract) and dataset description (title, description) are seemingly mixed up:
  

This is the dcat record used:

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:skos="http://www.w3.org/2004/02/skos/core#"
         xmlns:foaf="http://xmlns.com/foaf/0.1/"
         xmlns:dct="http://purl.org/dc/terms/"
         xmlns:vcard="http://www.w3.org/2006/vcard/ns#"
         xmlns:dcat="http://www.w3.org/ns/dcat#"
         xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
         xmlns:spdx="http://spdx.org/rdf/terms#"
         xmlns:adms="http://www.w3.org/ns/adms#"
         xmlns:prov="http://www.w3.org/ns/prov#"
         xmlns:owl="http://www.w3.org/2002/07/owl#"
         xmlns:schema="http://schema.org/"
         xmlns:locn="http://www.w3.org/ns/locn#"
         xmlns:gml="http://www.opengis.net/gml/3.2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://www.w3.org/1999/02/22-rdf-syntax-ns# http://localhost:8080/geonetwork/xml/schemas/dcat2/schema.xsd">
  <dcat:CatalogRecord rdf:about="http://localhost:8080/geonetwork/srv/api/records/837ac693-6803-4998-902f-76826ee7f9cf">
      <dct:identifier>837ac693-6803-4998-902f-76826ee7f9cf</dct:identifier>
      <dct:issued>2021-09-08T15:51:59.446Z</dct:issued>
      <dct:modified>2021-09-08T16:10:12.729Z</dct:modified>
      <dct:title>My test data title</dct:title>
      <dct:description>A description full of words.</dct:description>
      <dct:language rdf:resource="http://id.loc.gov/vocabulary/iso639-2/eng"/>
  </dcat:CatalogRecord>
  <dcat:Dataset>
      <dct:title>Test data</dct:title>
      <dct:description>Very good data indeaad</dct:description>
      <dcat:theme>
         <skos:Concept rdf:about="http://publications.europa.eu/resource/authority/data-theme/OP_DATPRO">
            <skos:prefLabel xml:lang="eng">Provisional data</skos:prefLabel>
            <skos:inScheme rdf:resource="http://publications.europa.eu/resource/authority/data-theme"/>
         </skos:Concept>
      </dcat:theme>
      <dcat:theme>
         <skos:Concept rdf:about="http://publications.europa.eu/resource/authority/data-theme/ENVI">
            <skos:prefLabel xml:lang="eng">Environment</skos:prefLabel>
            <skos:inScheme rdf:resource="http://publications.europa.eu/resource/authority/data-theme"/>
         </skos:Concept>
      </dcat:theme>
      <dct:type>
         <skos:Concept rdf:about="https://registry.geonetwork-opensource.org/dcat/type/dataset">
            <skos:prefLabel xml:lang="eng">Dataset</skos:prefLabel>
            <skos:inScheme rdf:resource="https://registry.geonetwork-opensource.org/dcat/type"/>
         </skos:Concept>
      </dct:type>
      <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-09-08</dct:issued>
      <dct:spatial>
         <dct:Location>
            <locn:geometry rdf:datatype="http://www.opengis.net/ont/geosparql#wktLiteral">POLYGON ((3.6352 47.1146,3.6352 52.5493,-5.857 52.5493,-5.857 47.1146,3.6352 47.1146))</locn:geometry>
            <locn:geometry rdf:datatype="http://www.opengis.net/ont/geosparql#gmlLiteral">&lt;gml:Polygon xmlns:gml="http://www.opengis.net/gml/3.2"&gt;&lt;gml:exterior&gt;&lt;gml:LinearRing&gt;&lt;gml:posList&gt;47.1146 3.6352 52.5493 3.6352 52.5493 -5.857 47.1146 -5.857 47.1146 3.6352&lt;/gml:posList&gt;&lt;/gml:LinearRing&gt;&lt;/gml:exterior&gt;&lt;/gml:Polygon&gt;</locn:geometry>
         </dct:Location>
      </dct:spatial>
      <dct:temporal>
         <dct:PeriodOfTime>
            <schema:startDate rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-09-01</schema:startDate>
            <schema:endDate rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-09-07</schema:endDate>
         </dct:PeriodOfTime>
      </dct:temporal>
      <dct:accessRights>
         <skos:Concept rdf:about="http://publications.europa.eu/resource/authority/access-right/PUBLIC">
            <rdf:type rdf:resource="http://purl.org/dc/terms/RightsStatement"/>
            <skos:prefLabel xml:lang="eng">public</skos:prefLabel>
            <skos:inScheme rdf:resource="http://publications.europa.eu/resource/authority/access-right"/>
         </skos:Concept>
      </dct:accessRights>
      <dcat:landingPage>
         <foaf:Document rdf:about="https://www.google.com"/>
      </dcat:landingPage>
      <dcat:distribution>
         <dcat:Distribution>
            <dct:description>Screenshot%20from%202021-03-30%2013-53-04.png</dct:description>
            <dcat:accessURL>http://localhost:8080/geonetwork/srv/api/records/837ac693-6803-4998-902f-76826ee7f9cf/attachments/Screenshot%20from%202021-03-30%2013-53-04.png</dcat:accessURL>
            <dct:format>
               <skos:Concept>
                  <rdf:type rdf:resource="http://purl.org/dc/terms/MediaTypeOrExtent"/>
                  <skos:prefLabel>WWW:OVERVIEW</skos:prefLabel>
               </skos:Concept>
            </dct:format>
         </dcat:Distribution>
      </dcat:distribution>
      <dcat:distribution>
         <dcat:Distribution>
            <dcat:downloadURL>http://localhost:8080/geonetwork/srv/api/records/837ac693-6803-4998-902f-76826ee7f9cf/attachments/surval_parametre_point.geojson</dcat:downloadURL>
            <dct:description>surval_parametre_point.geojson</dct:description>
            <dct:format>
               <skos:Concept>
                  <rdf:type rdf:resource="http://purl.org/dc/terms/MediaTypeOrExtent"/>
                  <skos:prefLabel>WWW:DOWNLOAD</skos:prefLabel>
               </skos:Concept>
            </dct:format>
         </dcat:Distribution>
      </dcat:distribution>
      <dcat:spatialResolutionInMeters>0.25</dcat:spatialResolutionInMeters>
      <dcat:temporalResolution>P0Y0M1DT0H0M0S</dcat:temporalResolution>
  </dcat:Dataset>
</rdf:RDF>

[fgravin]

@jeanpommier @fxprunayre you have worked on the plugin, could you please react on @jahow outputs about what seems to miss in the dcat editor, are we missing some confirmation, or is it well known that the feature is not implemented ?
Thanks

@jahow I think we should go for a submodule instead ? So we can contribute the enhancements/fixes we're going to make within the schema.

[fgravin]

Here are the problems I encountered in my tests:

Find the current status on the plugin
https://github.com/metadata101/dcat2/projects/1

[jeanpommier]

Here are the problems I encountered in my tests:

* keywords not working (no autocomplete, free text not saved)

To have the keywords autocompletion, you have to enable the virtual "all" thesaurus. This was an opinionated (and discussed) choice: to keep the edition ultra simple, we choose to limit the keywords entry to a single thesaurus.

[jahow]

@jahow I think we should go for a submodule instead ? So we can contribute the enhancements/fixes we're going to make within the schema.

it is now a submodule.