Re: Not quite crossing the pons asinorum of construct

[Benson Margulies]

Two queries. The first one works fine, the second one seems to be
prepared to run forever in tdbquery. I suppose that I haven't managed
to really understand the implications of BIND properly, or something.

PREFIX rex:   <http://www.basistech.com/ontologies/2010/6/rex.owl#>
PREFIX owl:   <http://www.w3.org/2002/07/owl#>
PREFIX rdfs:  <http://www.w3.org/2000/01/rdf-schema#>
PREFIX x-arq: <urn:x-arq:>

SELECT  ?rel
WHERE
{
       GRAPH x-arq:UnionGraph {

       # Items of interest.
          ?rel rdfs:subPropertyOf rex:relationship .
          }
}

---------------------------------------------------

PREFIX rex:   <http://www.basistech.com/ontologies/2010/6/rex.owl#>
PREFIX owl:   <http://www.w3.org/2002/07/owl#>
PREFIX rdfs:  <http://www.w3.org/2000/01/rdf-schema#>
PREFIX x-arq: <urn:x-arq:>

CONSTRUCT{ ?s ?p ?o }

WHERE
{
       GRAPH x-arq:UnionGraph {

       # Items of interest.
          ?rel rdfs:subPropertyOf rex:relationship .
          { BIND(?rel AS ?s) }
          ?s ?p ?o .
          }
}