What is the base URL of "The Document Components Ontology"?
SELECT ?iri
WHERE {
  orkgr:R8342 orkgp:compareContribution ?cont.
  ?cont orkgp:P7034 ?ont.
  ?ont orkgp:P7042 ?iri;
       orkgp:P7035 ?full_name.
  FILTER(REGEX(STR(?full_name), "Document Components Ontology", "i"))
}