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Re: Quick reality check please

From: Hugh Glaser <hg@ecs.soton.ac.uk>
Date: Mon, 21 Mar 2011 12:47:33 +0000
To: Richard Cyganiak <richard@cyganiak.de>
CC: "<nathan@webr3.org>" <nathan@webr3.org>, Linked Data community <public-lod@w3.org>
Message-ID: <EMEW3|c926af80ed9b154a6c61de891b2b5044n2KClx02hg|ecs.soton.ac.uk|59356956-BB17-4DB5-BF76-0935DBF20850@ecs.soton.ac.uk>
Thanks mate.
"There is a public SPARQL endpoint over the DBpedia data set at http://DBpedia.org/sparql."
I use the recommended routes :-)
I didn't think I wanted to "browse" - just stuff in some sparql queries.
This was not meant to be primarily about the dbpedia endpoint - I have had the same problem with others.

By the way, if you ask for XML from snorql the standard xslt throws the @en away.
To save me trying to investigate, what does snorql do with datatypes?

Cheers

On 21 Mar 2011, at 12:06, Richard Cyganiak wrote:

> Hugh,
> 
> There's
> http://dbpedia.org/sparql
> which as you noticed doesn't show language tags.
> 
> Then there's
> http://dbpedia.org/snorql
> which does it right.
> 
> Best,
> Richard
> 
> 
> On 21 Mar 2011, at 11:08, Hugh Glaser wrote:
> 
>> Thanks guys.
>> Sigh - not that one again.
>> The problem was I hadn't noticed I was getting back the yago URI, not the dbpedia resource.
>> It's just so hard :-)
>> 
>> Right - now I am officially pissed off.
>> The number of times I have wasted time trying to SPARQL for exact strings, only to find I have missed the @en or the ^^<http://www.w3.org/2001/XMLSchema#string>)
>> And then had to start messing about scrubbing around in xml or rdf to find out what I had missed.
>> All because the html version of SPARQL results decides I don't need to be bothered with trivia like that.
>> 
>> Just who was it that decided that this information was surplus to requirements when returning html from a SPARQL query?
>> It isn't. The primary reason anyone would be looking at the results of a SPARQL query is to work out exactly what is in the store.
>> So they can start querying.
>> And essentially the html is lying to me.
>> (Not just the dbpedia endpoint, but it seems pretty universal.)
>> 
>> This just isn't joined up:
>> When I do
>> select * where {<http://dbpedia.org/resource/World_Wide_Web_Consortium> ?p ?o}
>> I get back stuff that includes lines such as:
>> http://www.w3.org/2000/01/rdf-schema#label	World Wide Web Consortium
>> But if I now put back in essentially what I got out:
>> select * where {?s <http://www.w3.org/2000/01/rdf-schema#label> "World Wide Web Consortium"}
>> I get back
>> http://dbpedia.org/class/yago/WorldWideWebConsortium
>> 
>> The HTML, spreadsheet, Javascript and CSV give no hint of the lang.
>> So it is not just about a person having a problem - if I wrote an agent to process output and chose CSV I would have the same problem.
>> 
>> Time to improve the html output at the least?
>> 
>> Best
>> Hugh
>> 
>> PS While we are in SPARQL for dummies mode ( :-) ) what is the best way of doing a query for an exact string where I don't care about the language or the datatype?
>> I'm sure this is easy in SPARQL 1.1, as there have been so many users who would have needed it. I am hoping that the answer is not regex for such a common thing.
>> 
>> On 21 Mar 2011, at 01:05, Nathan wrote:
>> 
>>> select distinct ?s where {?s ?p "Arts and Humanities Research Council"@en}
>>> 
>>> :)
>>> 
>>> Hugh Glaser wrote:
>>>> dbpedia sparql endpoint is not doing what I expect.
>>>> select distinct ?s where {?s ?p "World Wide Web Consortium"}
>>>> gives an answer
>>>> select distinct ?s where {?s ?p "Arts and Humanities Research Council"}
>>>> doesn't.
>>>> But both
>>>> http://dbpedia.org/resource/World_Wide_Web_Consortium
>>>> and
>>>> http://dbpedia.org/resource/Arts_and_Humanities_Research_Council
>>>> are there with dbpprop:name and rdfs:label and the string.
>>>> What am I doing wrong?
>>>> The two queries as the actual URLs:
>>>> http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=select+distinct+%3Fs+where+%7B%3Fs+%3Fp+%22World+Wide+Web+Consortium%22%7D&debug=on&timeout=&format=text%2Fhtml&save=display&fname=
>>>> http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=select+distinct+%3Fs+where+%7B%3Fs+%3Fp+%22Arts+and+Humanities+Research+Council%22%7D&debug=on&timeout=&format=text%2Fhtml&save=display&fname=
>>>> Hope this is not a senior moment, but suspect it is :-)
>>> 
>> 
>> -- 
>> Hugh Glaser,  
>>             Intelligence, Agents, Multimedia
>>             School of Electronics and Computer Science,
>>             University of Southampton,
>>             Southampton SO17 1BJ
>> Work: +44 23 8059 3670, Fax: +44 23 8059 3045
>> Mobile: +44 78 9422 3822, Home: +44 23 8061 5652
>> http://www.ecs.soton.ac.uk/~hg/
>> 
>> 
>> 
> 

-- 
Hugh Glaser,  
              Intelligence, Agents, Multimedia
              School of Electronics and Computer Science,
              University of Southampton,
              Southampton SO17 1BJ
Work: +44 23 8059 3670, Fax: +44 23 8059 3045
Mobile: +44 78 9422 3822, Home: +44 23 8061 5652
http://www.ecs.soton.ac.uk/~hg/
Received on Monday, 21 March 2011 12:48:29 UTC

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