Fuse resources by key

fuse_by_key.sparql

PREFIX : <http://example.com/>

DELETE {
  ?r ?outP ?outO .
  ?inS ?inP ?r .
}
INSERT {
  ?sampleR ?outP ?outO .
  ?inS ?inP ?sampleR .
}
WHERE {
  {
    SELECT ?class ?name (SAMPLE(?r) AS ?sampleR)
    WHERE {
      # Select resources to fuse. 
      ?r a ?class ;
        :name ?name .
    }
    # Group by key(s)
    GROUP BY ?class ?name
  }
  ?r a ?class ;
    :name ?name .
  FILTER (!sameTerm(?r, ?sampleR))
  ?r ?outP ?outO .
  OPTIONAL {
    ?inS ?inP ?r .
  }
}