2012/2/29 Luis Daniel Ibáñez González <ldiban...@gmail.com>
> That's it. I'm thinking the answer is "no", but I haven't find any
> official word about it, so I prefere to ask.
>
> Thanks in advance.
>
I don't have the official answer for you, but I don't believe there are
blank nodes in DBpedia. It appears to me that DBpedia tries to give a URI
to everything, even if there isn't a corresponding Wikipedia article. I say
this because I know that there are objects that can be generated using the
DBpedia Extraction Framework that I would think would be blank nodes, but
are actually given URIs that aren't directly derived from Wikipedia URLs.
As an example, run the following query on live.dbpedia.org/sparql.
SELECT ?tm, ?name, ?position, ?squadNumber WHERE
{
?tm a dbpedia-owl:SportsTeamMember;
dbpedia-owl:team <
http://dbpedia.org/resource/2011%E2%80%9312_Everton_F.C._season>;
dbpedia-owl:position ?position;
dbpedia-owl:squadNumber ?squadNumber;
dbpedia-owl:currentMember [ rdfs:label ?name ].
}
ORDER BY ?squadNumber
(
http://live.dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=SELECT+%3Ftm%2C+%3Fname%2C+%3Fposition%2C+%3FsquadNumber+WHERE%0D%0A%7B%0D%0A++%3Ftm+a+dbpedia-owl%3ASportsTeamMember%3B%0D%0A++++dbpedia-owl%3Ateam+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2F2011%25E2%2580%259312_Everton_F.C._season%3E%3B%0D%0A++++dbpedia-owl%3Aposition+%3Fposition%3B%0D%0A++++dbpedia-owl%3AsquadNumber+%3FsquadNumber%3B%0D%0A++++dbpedia-owl%3AcurrentMember+%5B+rdfs%3Alabel+%3Fname+%5D.%0D%0A%0D%0A%7D%0D%0AORDER+BY+%3FsquadNumber&should-sponge=&format=text%2Fhtml&timeout=0&debug=on
)
What you get back is a list of players that played for Everton F.C. in the
2011–2012 season. Taking one result from that:
<
http://dbpedia.org/resource/2011%E2%80%9312_Everton_F.C._season__Leighton_Baines__1>,
"Leighton
Baines"@en, "DF"@en, 3
Leighton Baines has a Wikipedia entry, and therefore a DBpedia URI, but
this isn't it. This URI doesn't refer to Leighton Baines himself, but
rather refer's to the concept of Leighton Baines playing for Everton in the
2011–2012 season, something that isn't noteworthy enough to have a
Wikipedia article itself.
I would fully expect this node to be some sort of blank node, but DBpedia
gives it a URI anyway. This doesn't prove that there are no blank nodes in
DBpedia, but it lends credence to the idea that DBpedia is trying to give
URIs to everything, even if there isn't a Wikipedia page for it.
Bryan Burgers
------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
_______________________________________________
Dbpedia-discussion mailing list
Dbpedia-discussion@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
