Possible support for "services" in the new version of DCAT

[andrea-perego]

The W3C DXWG is considering extending the scope of DCAT to resources different from datasets (services included). This proposal is documented in w3c/dxwg#172.

The GeoDCAT-AP specification could be revised accordingly, taking nonetheless into account backward compatibility.

[andrea-perego]

DCAT 2 defines a specific class dcat:DataService, and 3 specific properties - dcat:endpointDescription, dcat:endpointURL, and dcat:servesDataset.

DCAT-AP 2 as adopted these class and properties (see SEMICeu/DCAT-AP#73), so they should be inherited by GeoDCAT-AP.

[andrea-perego]

This revision has been implemented in the first working draft for GeoDCAT-AP 2.0.0:

https://semiceu.github.io/GeoDCAT-AP/drafts/2.0.0-draft-0.1/