A SPARQL update to replace blank nodes with IRIs

skolemize.ru

PREFIX ex: <http://example.org/>

INSERT {
  ?node ex:skolem ?iri .
}
WHERE {
  {
    SELECT DISTINCT ?node
    WHERE {
      { ?node ?p1 ?o1 . }
      UNION
      { ?s2 ?p2 ?node . }
      FILTER(isBlank(?node))
    }
  }
  BIND (UUID() AS ?iri)
}
;
DELETE {
  ?node ?p ?o .
}
INSERT {
  ?iri ?p ?o .
}
WHERE {
  ?node ex:skolem ?iri .
  ?node ?p ?o .
  FILTER(?p != ex:skolem)
}
;
DELETE {
  ?s ?p ?node .
}
INSERT {
  ?s ?p ?iri .
}
WHERE {
  ?node ex:skolem ?iri .
  ?s ?p ?node .
  FILTER(?p != ex:skolem)
}
;
DELETE WHERE {
  ?node ex:skolem ?iri .
}