We (in the BBC Search team) are still seeing the problem below.
To recap, Dave wrote:
> I'm having difficulty querying dbpedia using the sparql interface on
>
> http://dbpedia-live.openlinksw.com/sparql
>
> I'm requesting the label, abstract and a list of redirects, and
> approx. 20% of the time I'm just getting the redirects.
For example using a simple SPARQL query like
SELECT ?abstract WHERE {
<http://dbpedia.org/resource/Ferrari>
<http://dbpedia.org/property/abstract> ?abstract .
FILTER ( langMatches( lang(?abstract), 'en') || !
langMatches(lang(?abstract),'*') )
}
on dbepdia.org/sparql gives the abstract that you¹d expect; running it on
dbpedia-live.openlinksw.com/sparql doesn¹t find it. However if you use
abstract_live rather than abstract then it does find something although
surprisingly it finds two different abstracts!
Just to be explicit, running this query
SELECT ?abstract WHERE {
<http://dbpedia.org/resource/Ferrari>
<http://dbpedia.org/property/abstract_live> ?abstract .
FILTER ( langMatches( lang(?abstract), 'en') || !
langMatches(lang(?abstract),'*') )
}
on dbpedia-live.openlinksw.com/sparql does give a result, in fact it gives
two!
So really I have three main questions (although any information would be
useful):
1. What is the http://dbpedia.org/property/abstract_live property?
2. Cam we safely use it instead of http://dbpedia.org/property/abstract
3. Why does it have more than one value?
We are seeing this on around 20% of the resources that we are interested in,
and is preventing us from using the Live DBPedia at present.
Thanks very much,
Stephn.
On 15/1/10 12:06, "[email protected]"
<[email protected]> wrote:
>
> -----------------------------
>
> Message: 2
> Date: Fri, 15 Jan 2010 11:05:54 +0000
> From: David Spacey <[email protected]>
> Subject: [Dbpedia-discussion] Inconsistent results from sparql queries
> To: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> Hi,
>
> I'm having difficulty querying dbpedia using the sparql interface on
>
> http://dbpedia-live.openlinksw.com/sparql
>
> I'm requesting the label, abstract and a list of redirects, and
> approx. 20% of the time I'm just getting the redirects. With an
> internal instance, running an older snapshot of dbpedia, I'm seeing
> the same problem for around 1% of queries. In every example I've
> checked, the dbpedia id is still current.
>
> So, here are some examples.
>
> Failing on dbpedia-live only
> Adolf_Hitler
> Chicago
> Dora_Bryan
> Emma_Thompson
> Ferrari
>
> Failing on snapshot only
> Austriamicrosystems
> Valery_Gergiev
> Lady_Rachel_Billington
>
> Failing on both
> G20
> Darcy_Edwards
>
> This is the query I'm using, where '$lod_id' is one of the strings
> listed above.
>
> SELECT ?label, ?abstract, ?redirect, COUNT(?wikilink)
> WHERE {
> {
> <http://dbpedia.org/resource/$lod_id> <http://dbpedia.org/
> property/abstract> ?abstract .
> FILTER ( langMatches( lang(?abstract), 'en') || ! langMatches
> (lang(?abstract),'*') ) .
> <http://dbpedia.org/resource/$lod_id> <http://www.w3.org/2000/01/
> rdf-schema#label> ?label .
> FILTER ( langMatches( lang(?label), 'en') || ! langMatches(lang(?
> label),'*') ) .
> }
> UNION
> {
> OPTIONAL {
> ?redirect <http://dbpedia.org/property/redirect> <http://
> dbpedia.org/resource/$lod_id> .
> OPTIONAL { ?wikilink <http://dbpedia.org/property/wikilink> ?
> redirect }
> }
> }
> }
>
> Can anyone suggest why this might fail for valid entries?
>
> TIA
>
> Dave Spacey
>
>
> http://www.bbc.co.uk/
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