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Re: DBpedia endpoint vs LOD endpoint ?

From: Patrick van Kleef <pkleef@openlinksw.com>
Date: Tue, 17 Aug 2010 22:25:02 +0200
To: Alexandre Passant <alexandre.passant@deri.org>
Message-Id: <63E3F3A5-10F6-42C3-A1EF-24A883E5E85C@openlinksw.com>
Cc: Linked Data community <public-lod@w3.org>
HI Alexandre,

>>>
>>> Running SPARQL queries on the DBpedia endpoint [1] produces  
>>> different results than queries on the LOD one [2] when restricting  
>>> to the dbpedia graph.
>>> Which one contains the latest datasets ?
>>>
>>> NB: Is there a voiD description associated to these endpoints ?
>>>
>>> [1] http://dbpedia.org/sparql
>>> [2] http://lod.openlinksw.com/sparql
>>
>>
>> Both dbpedia.org and lod.openlinksw.com contain the same DBpedia  
>> 3.5.1 dataset, however in LOD certain datafiles are loaded in their  
>> own graph at this time:
>
> Thanks - but how comes that I have different results on the  
> endpoints while indicating http://dbpedia.org as the default graph  
> in both queries ?
> For instance, when running
>
> SELECT ?o count(?o) as ?c WHERE {
>  ?s rdf:type ?o
> }
> ORDER BY DESC(?c)
> LIMIT 50
>
> I have
>
> http://dbpedia.org/class/yago/LivingPeople	236951
>
> As a result on the DBpedia endpoint, but not on the LOD one.
> Are the Yago mappings loaded in the http://dbpedia.org graph (and  
> not on the Yago one, as you mention below) in the DBpedia endpoint ?
>

No, as stated before on LOD the yago class data is in a separate  
graph, so you would need to use:

SELECT ?o count(?o) as ?c
FROM <http://dbpedia.org/yagoclasses>
WHERE {
  ?s rdf:type ?o
}
ORDER BY DESC(?c)
LIMIT 50

See:
     http://bit.ly/bF0yo3


>>
>> bookmashup_links.nt.gz     http://dbpedia.org/bookmashup
>> dailymed_links.nt.gz       http://dbpedia.org/dailymed
>> dblp_links.nt.gz           http://dbpedia.org/dblp
>> diseasome_links.nt.gz      http://dbpedia.org/diseasome
>> drugbank_links.nt.gz       http://dbpedia.org/drugbank
>> eurostat_links.nt.gz       http://dbpedia.org/eurostat
>> factbook_links.nt.gz       http://dbpedia.org/factbook
>> flickr_links.nt.gz         http://dbpedia.org/flickr
>> freebase_links.nt.gz       http://dbpedia.org/freebase
>> geonames_links.nt.gz       http://dbpedia.org/geonames
>> gutenberg_links.nt.gz      http://dbpedia.org/gutenberg
>> musicbrainz_links.nt.gz    http://dbpedia.org/musicbrainz
>> nyt_links.nt.gz            http://dbpedia.org/nyt
>> opencyc_links.nt.gz        http://dbpedia.org/opencyc
>> revyu_links.nt.gz          http://dbpedia.org/revyu
>> sider_links.nt.gz          http://dbpedia.org/sider
>> tcm_links.nt.gz            http://dbpedia.org/tcm
>> uscensus_links.nt.gz       http://dbpedia.org/uscensus
>> wikicompany_links.nt.gz    http://dbpedia.org/wikicompany
>> wordnet_links.nt.gz        http://dbpedia.org/wordnet
>> yago_links.nt.gz           http://dbpedia.org/yago
>> yagoclasses_links.nt.gz    http://dbpedia.org/yagoclasses
>>
>>
>> All other dbpedia data files are loaded in http://dbpedia.org

Best regards,

Patrick
Received on Tuesday, 17 August 2010 20:25:37 UTC

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