Re: [Rdfapi-php-interest] SPARQL OPTIONAL error

[Sergey C. <rdf...@an...>]

Yep, looks like it works - I've added a patch to sf.net site.

       Sergey


On Fri, Aug 15, 2008 at 12:34 PM, Sergey Chernyshev <
rdf...@an...> wrote:

> Thanks, Will, I'll give it a shot!
>
>           Sergey
>
>
>
> On Thu, Aug 14, 2008 at 6:06 AM, Will Daniels <ma...@wi...>wrote:
>
>>  This sounds like a bug I filed back in March (fix provided) though I
>> don't remember the details precisely now to confirm 100% that it's the same
>> issue:
>>
>>
>> http://sourceforge.net/tracker/index.php?func=detail&aid=1928579&group_id=63257&atid=503361
>>
>> Unfortunately, the bugs do not appear to be attended to. If anybody can
>> and wants to grant me access to the svn, I'd be happy to fix a few.
>>
>> Regards,
>> Will
>>
>> Sergey Chernyshev wrote:
>>
>> It looks like RAP is having a significant issue with handling OPTIONAL
>> blocks - when variable from mandatory part is also used within OPTIONAL
>> block and non-optional part of the query matches nothing, OPTIONAL block
>> still gets executed as if there was no mandatory part of the query.
>>
>> For example, query like this:
>> *PREFIX dc: <http://purl.org/dc/elements/1.1/>*
>> *PREFIX foaf: <http://xmlns.com/foaf/0.1/>*
>> *SELECT ?blog, ?title WHERE {*
>>  *<http://www.sergeychernyshev.com/sergey> foaf:weblog ?blog .*
>> *OPTIONAL { ?blog dc:title ?title}*
>>  *}*
>>
>> ran against http://www.sergeychernyshev.com/sergey.rdf (where foaf:weblog
>> triple exists) works fine and returns one entry with defined ?blog and empty
>> ?title.
>>
>> But query
>> *PREFIX dc: <http://purl.org/dc/elements/1.1/>*
>> *PREFIX foaf: <http://xmlns.com/foaf/0.1/>*
>> *SELECT ?blog, ?title WHERE {*
>>  *<http://www.w3.org/People/Berners-Lee/card#i> foaf:weblog ?blog .*
>> *OPTIONAL { ?blog dc:title ?title}*
>>  *}*
>>  ran against http://www.sergeychernyshev.com/profile/tests/timbl.rdf(where no foaf:weblog triples exist) returns ?blog variables bound to all
>> subjects that have dc:title properties as if this query was ran
>> *PREFIX dc: <http://purl.org/dc/elements/1.1/>*
>> *PREFIX foaf: <http://xmlns.com/foaf/0.1/>*
>> *SELECT ?blog, ?title WHERE {*
>>  *OPTIONAL { ?blog dc:title ?title}*
>>  *}*
>>
>> I don't even know how to approach this! Will appreciate any help.
>>
>> Thank you,
>>
>>           Sergey
>>
>>
>>  --
>> Sergey Chernyshev
>> http://www.sergeychernyshev.com/
>>
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>>
>
>
> --
> Sergey Chernyshev
> http://www.sergeychernyshev.com/
>



-- 
Sergey Chernyshev
http://www.sergeychernyshev.com/