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Re: ISSUE: Malformed literals and non-lexical literals

From: Bijan Parsia <bparsia@cs.man.ac.uk>
Date: Thu, 17 Aug 2006 12:46:57 +0100
Message-Id: <FBD78D83-7222-4D11-B4C7-0C10D757D39C@cs.man.ac.uk>
Cc: Pat Hayes <phayes@ihmc.us>, RDF Data Access Working Group <public-rdf-dawg@w3.org>
To: andy.seaborne@hp.com

On Aug 17, 2006, at 12:39 PM, Seaborne, Andy wrote:

> Bijan Parsia wrote:
>> Thanks Andy, that was interesting.
>> On Aug 17, 2006, at 10:20 AM, Seaborne, Andy wrote:
>>> Output from ARQ (using the standalone expression evaluator  
>>> because  it explains what is going on; ASK queries mask this):
>>>
>>> Reformatted for email.
>>>
>>> ==== Test 1
>>>
>>> arq.qexpr "'-5'^^xsd:positiveInteger < 5" ==> error
>>>
>>> 10:06:46 WARN  NodeValue
>>>     Datatype format exception: "-5"^^xsd:positiveInteger
>>> Exception: Can't compare "-5"^^<http://www.w3.org/2001/  
>>> XMLSchema#positiveInteger> and 5
>> You say that the warnings do not affect the results.
>
> Warnings are output as logging messages.  Ignore then for the value  
> of the expression.  ARQ just outputs some logging stuff for caes  
> where the user may find it useful.  As ARQ (and Jena and Joseki)  
> uses Jakarta Commons Logging (and log4j usually) the user/app can  
> pick and choose logging messages anyway.
>
> > But this is
>> wrong behavior, yes?
>> """Specifically, FILTERs eliminate any solutions that, when   
>> substituted into the expression, result in either an effective   
>> boolean value of false or produce an error. """
>
> This is showing the result of an expression evaluation, not the  
> full filter evaluation.  That's why I didn't use an ASK query.

Ok, but surely the relevant bit is how this expression evaluation  
affects filter evaluation.

> 	Andy
>
>> So, given data
>> 	:b :p "-5"^^xsd:positiveInteger.
>> 	:b :q "5"^^xsd:positiveInteger.
>> and query
>> 	SELECT ?x {?x :p ?L1. ?x :q ?L2. FILTER ?L1 < ?L2}
>> ARQ returns
>> 	?x/:b
>> instead of no answers?

Hence wondering what ARQ does in this specific case.

Cheers,
Bijan.
Received on Thursday, 17 August 2006 11:47:36 GMT

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