W3C home > Mailing lists > Public > public-lod@w3.org > March 2011

Re: Problems with SPARQL on WWW4 server

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Sun, 20 Mar 2011 10:53:03 -0400
Message-ID: <4D8614CF.1090308@openlinksw.com>
To: Danny Ayers <danny.ayers@gmail.com>
CC: public-lod@w3.org
On 3/20/11 9:59 AM, Danny Ayers wrote:
> (Not sure which list is most appropriate - please advise)
>
> I'm getting a lot of errors querying against:
>
> http://www4.wiwiss.fu-berlin.de/factbook/sparql
>
> while some queries work, e.g.
>
> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
>
> SELECT DISTINCT ?s WHERE {
> ?s rdfs:label ?label .
> FILTER REGEX(?label, "libya", "i")
> }
>
> many others fail, e.g.
>
> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
>
> SELECT DISTINCT * WHERE {
> <http://www4.wiwiss.fu-berlin.de/factbook/resource/Libya>  ?p ?o
> }
>
> =>
>
> ...
> <h2>HTTP ERROR: 500</h2><pre>rethrew:
> de.fuberlin.wiwiss.d2rq.D2RQException: Table 'factbook.neighbors'
> doesn't exist: SELECT DISTINCT `T0_neighbors`.`name_encoded` FROM
> `bordercountries` AS `T0_bordercountries`, `neighbors` AS
> `T0_neighbors`, `countries` AS `T0_countries` WHERE
> `T0_bordercountries`.`Landboundaries_bordercountries_title` =
> `T0_neighbors`.`Name` AND `T0_bordercountries`.`Name` =
> `T0_countries`.`Name` AND `T0_countries`.`name_encoded` = 'Libya'
> (E0)</pre>
> <p>RequestURI=/sparql</p><p><i><small><a
> href="http://jetty.mortbay.org/">Powered by Jetty://</a>
> ...
>
> Cheers,
> Danny.
>
Danny,

Is this just a ping to Chris and co. about their particular Linked Data 
Space or a quest for detailed information about 'Libya' ?

Assuming this is a quest for information about 'Libya' across LOD 
datasets, you can also look at:

1. 
http://lod.openlinksw.com/describe/?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FLibya 
-- 6 pages of facts about an entity associated with  'Libya'

2. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FLibya&tp=2 
-- source graph IRIs

3. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FLibya&tp=3 
-- lists of IRI/URIs that have selected entity associated with 'Libya' 
as co-referent

4. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FLibya&tp=4 
-- co referent lists assembled via a fuzzy IFP rule using foaf:name .

-- 

Regards,

Kingsley Idehen	
President&  CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
Received on Sunday, 20 March 2011 14:53:31 UTC

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