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Re: Re: New tests to cover missing algebraic forms

From: Chimezie Ogbuji <ogbujic@ccf.org>
Date: Tue, 14 Aug 2007 10:17:50 -0400
To: "W3C Data Access Working Group" <public-rdf-dawg@w3.org>
Message-ID: <1187101070.31511.9.camel@otherland>

> >
> > Thanks, Chimezie.
> >
> > I added a trailing period to algebra/join-combo-graph-2.ttl and to 
> > optional/complex-data-1.ttl and to optional/result-complex*.ttl to get the 
> > parser I'm using to be happy. I also removed a stray " from a namespace 
> > declaration in result-opt-complex-2.ttl .

Well spotted, thanks.

> >> The new tests are:
> >> http://www.w3.org/2001/sw/DataAccess/tests/data-r2/algebra/manifest#join-combo-1
> >> Algebra form: Join(LeftJoin(BGP(..),{..}),Join(BGP(..),Union(..,..)))
> >> Comment: Tests nested combination of Join with a BGP / OPT and a BGP /
> >> UNION
> >> PREFIX :    <http://example/>
> >> SELECT ?a ?y ?d ?z
> >> {     ?a :p ?c OPTIONAL { ?a :r ?d }.     ?a ?p 1 { ?p a ?y } UNION { ?a 
> >> ?z ?p } }
> >
> > The result set here has two bindings for ?y. I'm guessing that one (the one 
> > bound to a literal) should be ?d 

Yes, it is supposed to be ?d.  I.e.,:

?a -> http://example/x1
?y -> http://www.w3.org/1999/02/22-rdf-syntax-ns#Property
?d -> 4^^xsd:integer

I've made this change

> but even then I don't think I'd agree with 
> > the test. Does the test assume RDF entailment (specifically knowing that if 
> > :a :b :c then :b a rdf:Property)?

As written it doesn't, since the relevant statement (about rdf:Property)
is explicitly asserted in the dataset:

:p a rdf:Property

Though I can see how the use of rdf:Property would seem to suggest RDF

Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
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Received on Tuesday, 14 August 2007 14:18:20 UTC

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