cubicweb #5548677 new rdfio(?) object as a replacement of xy [in-progress]

comapring to existing xy:

  • we target rdf, not xml (handle triplet, not structure)
  • API should be cleaner wrt prefix handling
  • should be build as needed, not a global object
  • should probably only attempt to handle the dead simple part of the yams <> rdf mapping and let other specialized code deal with more complicated stuff

See implementation in the skos cube.

done in<not specified>
closed by<not specified>
patch[rdfio] Backport module skos.rdfio into cubicweb.rdfio [rejected]