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

[Will D. <ma...@wi...>]

Thanks Sergey! I might have submitted a patch in the first instance, 
only my head was spinning a little by the time I'd managed to figure out 
all the code and I wanted somebody who knew it already to confirm sanity 
first. But since there are two others now to support the fix...hopefully 
submitting a patch will make the necessary difference (I think maybe the 
person who was maintaining the SPARQL client disappeared because the 
only svn commits I've noticed look to be for things to fix pubby).

Regards,
Will


Sergey Chernyshev wrote:
> Yep, looks like it works - I've added a patch to sf.net 
> <http://sf.net> site.
>
>        Sergey
>
>
> On Fri, Aug 15, 2008 at 12:34 PM, Sergey Chernyshev 
> <rdf...@an... 
> <mailto: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... <mailto: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
>         <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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>>
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>
>
>
>
>     -- 
>     Sergey Chernyshev
>     http://www.sergeychernyshev.com/
>
>
>
>
> -- 
> Sergey Chernyshev
> http://www.sergeychernyshev.com/