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Re: another update test added (was: RE: Questions on grammar restrictions on Blank Node reuse across...)

From: Gregory Williams <greg@evilfunhouse.com>
Date: Sat, 26 May 2012 11:01:42 -0400
Cc: public-rdf-dawg@w3.org
Message-Id: <10C638F0-933B-4985-AAD9-5CF569E0068C@evilfunhouse.com>
To: Axel Polleres <axel@polleres.net>
On May 26, 2012, at 3:28 AM, Axel Polleres wrote:

> As per 
> 
>  http://lists.w3.org/Archives/Public/public-rdf-dawg/2012AprJun/0165.html
> 
> I added the test case corresponding to this one:
> 
>>> 2) Do we agree that the semantics of
>>> 
>>>   update1 =  INSERT { GRAPH<g2>  { ?S ?P ?O } }
>>>              WHERE { GRAPH<g1>  {?S ?P ?O } } ;
>>>              INSERT { GRAPH<g2>  { ?S ?P ?O } }
>>>              WHERE { GRAPH<g1>  {?S ?P ?O } }
>>> 
>>>   should be GS''
> 
> now under:
> 
> http://www.w3.org/2009/sparql/docs/tests/data-sparql11/basic-update/insert-05.ru
> 
> (since I have no implementation at hand to run it at the moment, I'd appreciate feedback in case there's any issues)

Do you think there's an automated way to test this? I ran the new test against my engine, and it failed. Here's why:

   mf:result [
                ut:graphData [ ut:graph <insert-05-g1-pre.ttl> ;
                               rdfs:label "http://example.org/g1" ] ;
                ut:graphData [ ut:graph <insert-05-g1-pre.ttl> ;
                               rdfs:label "http://example.org/g2" ] ;
             ] ;

When my test harness parses insert-05-g1-pre.ttl into the two graphs, the bnode will be parsed twice, in two different contexts, yielding two different internal blank node labels (do we agree that this is the expected behavior?). And so instead of comparing my actual results against

GS'' = {}
    <g1> { _:b :p :o }
    <g2> { _:b :p :o }

I end up comparing against something new:

GS'''' = {}
    <g1> { _:b :p :o }
    <g2> { _:c :p :o }

Which still succeeds at testing for the operation being idempotent, but has different bnodes in the two graphs.

I'm not sure how to make this succeed except by manually "fixing" my test results before submitting them (which I really don't want to do).

.greg
Received on Saturday, 26 May 2012 15:02:10 GMT

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