How to add extra-column to RDF_QUAD with access from sparql query?


#1

Hi! From here http://docs.openlinksw.com/virtuoso/virtuosofaq13/ i’ve found, that it’s possible to add some extra data to triple… and create some kind of megaQuad :).

I need to store somewhere SingletonProperty Uri for storing metadata (in other words - id of every triple).
We use singleton property methodology from here https://www.slideshare.net/ntkimvinh7/www2014-singleton-propertyfinal .

Now we have such queries:

SELECT * WHERE {
  GRAPH ?g {
  ?resourceUri ?spUri ?value.
  ?spUri rdf:singletonPropertyOf ?predicate.
  }
}

But it would be so nice to have queries like this:

SELECT * WHERE {
  GRAPH ?g {
      ?resourceUri ?predicate ?value ?spUri.
  }
}

Is this possible to add some extra column to RDF_QUAD and change base sparql pattern in virtuoso?
Give me the way, please :slight_smile: