Write Wikidata query to provide bibliographic metadata in Dublin Core format

[Daniel-Mietchen]

This builds on

• Provide OAI-PMH endpoint for Wikidata #10
• Set up an instance of InvenioRDM #20
• Document integration of Dublin Core with Wikidata #38

[Daniel-Mietchen]

The main idea here is to query Wikidata for the information pertaining to all the Dublin Core fields we need, and then to do the file conversion via an external script. We could, however, look into doing it all in SPARQL.

[Daniel-Mietchen]

A first version of that query now exists in https://github.com/InvasionBiologyHypotheses/enKORE-corpus-processor/blob/main/.github/workflows/flat.yml :

SELECT DISTINCT ?item ?itemLabel ?license ?licenseLabel ?entryUpdatedDate WHERE {
  ?item wdt:P5008 wd:Q56241615;
    wdt:P275 ?license.
  ?license ((wdt:P31*)/(wdt:P279*)) wd:Q30939938.
  OPTIONAL { ?item schema:dateModified ?entryUpdatedDate ; }
  SERVICE wikibase:label { bd:serviceParam wikibase:language "en,en". }
}
GROUP BY ?item ?itemLabel ?license ?licenseLabel ?entryUpdatedDate
ORDER BY (?item)