Am 31.08.2013 19:58, schrieb Kingsley Idehen:
Suggesting the use of Wikidata URIs will disallow retrieving:
<http://www.wikidata.org/entity/QXXX> a dbo:Person .
<http://www.wikidata.org/entity/QXXX> dbo:birthPlace
"1960-01-01"^^xsd:date .
See my example:
## Wikidata RDF document describes a 'Person' class
<http://www.wikidata.org/entity/Q215627>
<http://open.vocab.org/terms/describes>
<http://www.wikidata.org/entity/Q215627#this> .
## Wikidata 'Person' class is equivalent to DBpedia 'Person' class
<http://www.wikidata.org/entity/Q215627#this>
owl:equivalentClass dbpedia-owl:Person .
That's a fine pattern for an OWL class mapping.
ABox (Assertions):
## Wikidata RDF Document describes 'Douglas Adams' but without
explicit denotation via a URI
## thus, "#this" heuristic is used to derive a Linked Data URI for
'Douglas Adams' from the Wikidata RDF Document URL.
<http://www.wikidata.org/entity/Q42>
<http://open.vocab.org/terms/describes>
<http://www.wikidata.org/entity/Q42#this> ;
foaf:primaryTopic <http://www.wikidata.org/entity/Q42#this> .
## derived URI for 'Douglas Adams' is then used as the subject or
object of an owl:sameAs relation with the DBpedia URI for 'Douglas Adams'
<http://www.wikidata.org/entity/Q42#this>
owl:sameAs <http://dbpedia.org/resource/Douglas_Adams> .
I could agree for Wikidata URIs with a mapping to a DBpedia URI, but
what about the remaining
8.948.128 URIs, which do not have such mapping ( 13,266,153 - 4,318,025,
numbers are not accurate, because of functional pages)
The owl:sameAs Linked Data doesn't work in these cases.
--
Sebastian
while this will do:
<http://wd.dbpedia.org/entity/QXXX> a dbo:Person .
<http://wd.dbpedia.org/entity/QXXX> dbo:birthPlace
"1960-01-01"^^xsd:date .
<http://wd.dbpedia.org/entity/QXXX> owl:sameAs
<http://www.wikidata.org/entity/QXXX> .
You don't need that, if you follow the pattern outlined in the example
above. You arrive at the very same place via:
<http://www.wikidata.org/entity/Q42#this> owl:sameAs
<http://dbpedia.org/resource/Douglas_Adams> .
Both URIs resolve, and if owl:sameAs reasoning is applied, you get the
union based mesh (smush) of the triples describing both of the
entities participating in the aforementioned relation.
I am against losing this feature. Please everybody look at:
https://www.wikidata.org/wiki/Special:EntityData/Q42.ttl
You can find *only* labels and language links, not the "cool" data.
Yes, because that's a Turtle document, as per my example.
Furthermore, I doubt that this will be available any time soon.
Cleaning datatypes is no easy process. Hady is still young, but
already quite a good and goal-oriented programmer and working
overtime, so it is quite an investment, which is probably not high on
their list.
Failing to provide crawlable linked data will likely result in an
effort like dbpedialite to fill the gap.
We might shorten wikidata.dbpedia.org to wd.dbpedia.org though or
just data.dbpedia.org
@Kingsley and JC: do you agree?
I agree with the fact that any mapping endeavor MUST keep
follow-your-nose pattern crawling intact. I also believe we can
achieve this via "#this" heuristic which ultimately save time and work
in the future, one in which Wikidata will get better at publishing RDF
based documents that bear Linked Data :-)
Kingsley
--
Sebastian
Am 31.08.2013 09:20, schrieb Dimitris Kontokostas:
Hi Kingsley,
Sorry but I still don't see a clear solution with your suggestion.
Just like in Wikipedia when we see an Infobox_Person we assume that
the resource is an dbo:Person
we want to do the same in WikiData when we see a P107 Q215627
<http://www.wikidata.org/entity/Q215627> claim
In the 1st case it's an unstructured text to LD the 2nd is an LD2LD
but to a less complicated and well-known schema (that will make
existing DBpedia queries compatible to Wikidata)
Thus, When I wrote the triple Q42 a dbo:Person, that triple did not
came from dbr:Douglas_Adams as you replied but directly from the
Wikidata claim
Now, does Q42 need to be the original Wikidata resource
<http://www.wikidata.org/entity/Q42> and if yes, how should DBpedia
publish & dereference these triples?
Or should we use our own domain and make owl:sameAs /
foaf:primaryTopic links to Wikidata like we did with all Wikipedia
language editions?
Other suggestions / directions are also welcome of course!
Best,
Dimitris
On Fri, Aug 30, 2013 at 7:45 PM, Kingsley Idehen
<kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:
On 8/30/13 12:25 PM, Dimitris Kontokostas wrote:
Thanks Kingsley,
for now we don't host the data so
wikidata.dbpedia.org/resource/
<http://wikidata.dbpedia.org/resource/>.. does not dereference
anything
lets take an example to recup
Q42 (Douglas Adams), besides the answer to the ultimate
question [1] :) has the following triple
http://www.wikidata.org/entity/Q42
http://www.wikidata.org/entity/P107
http://www.wikidata.org/entity/Q215627
which in our dump *will* be translated to
http://wikidata.dbpedia.org/resource/Q42 owl:sameAs
http://www.wikidata.org/entity/Q42
http://wikidata.dbpedia.org/resource/Q42 rdf:type
dbpedia-owl:Person
If I get it right, your suggestion is to generate this triple
directly right?
http://www.wikidata.org/entity/Q42 rdf:type dbpedia-owl:Person
but in this case, when someone opens Q42 he/she will not see
out added triples
Having taken a closer look at the RDF content in WikiData
documents It should be:
<http://www.wikidata.org/entity/Q42> foaf:primartyTopic
<http://dbpedia.org/resource/Douglas_Adams>
<http://dbpedia.org/resource/Douglas_Adams> .
To be really safe, i.e., not vulnerable to changes relating to
how they evolve handling of entity disambiguation via content
negotiation etc., you can opt to be much more specific about the
RDF document URLs:
<http://www.wikidata.org/entity/Q42.nt> foaf:primaryTopic
<http://dbpedia.org/resource/Douglas_Adams>
<http://dbpedia.org/resource/Douglas_Adams> .
http://www.wikidata.org/entity/Q42.rdf> foaf:primaryTopic
<http://dbpedia.org/resource/Douglas_Adams>
<http://dbpedia.org/resource/Douglas_Adams> .
That's it, let the Web of Linked Data do the rest :-)
Kingsley.
Cheers,
Dimitris
[1]
http://en.wikipedia.org/wiki/42_%28number%29#The_Hitchhiker.27s_Guide_to_the_Galaxy
On Fri, Aug 30, 2013 at 5:57 PM, Kingsley Idehen
<kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:
On 8/29/13 2:45 PM, Hady elsahar wrote:
i guess what we need now is to map between the original
WikiData URIs and their URIs we use in DBpedia under the
new namespace , for example :
<http://wikidata.dbpedia.org/resource/Q1293045> owl:sameAs
<http://wikidata.org/entity/Q1293045>
No.
As per my last two mails. You are making unnecessary work
here. Wikidata is publishing RDF based Linked Data. Thus,
simply use their URIs.
Example of the implications of your current approach:
curl -ILH "Accept: text/turtle"
http://wikidata.dbpedia.org/resource/Q1293045
curl: (6) Couldn't resolve host 'wikidata.dbpedia.org
<http://wikidata.dbpedia.org>'
Just map the WikiData URI to the DBpedia URI and you
leverage the benefits of:
curl -ILH "Accept: text/turtle"
http://wikidata.org/entity/Q1293045
HTTP/1.0 301 Moved Permanently
Date: Fri, 30 Aug 2013 14:51:49 GMT
Server: Apache
*Location: http://www.wikidata.org/entity/Q1293045*
*Content-Type: text/html*; charset=iso-8859-1
HTTP/1.0 302 Moved Temporarily
Date: Fri, 30 Aug 2013 14:51:49 GMT
Server: Apache
*Location:
https://www.wikidata.org/wiki/Special:EntityData/Q1293045*
*Content-Type: text/html*; charset=iso-8859-1
HTTP/1.1 303 See Other
Server: nginx/1.1.19
Date: Fri, 30 Aug 2013 14:51:54 GMT
*Content-Type: text/html*; charset=utf-8
Connection: close
X-Content-Type-Options: nosniff
Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
Vary: Accept-Encoding,X-Forwarded-Proto,Cookie
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Last-Modified: Fri, 30 Aug 2013 14:51:54 GMT
*Location:
https://www.wikidata.org/wiki/Special:EntityData/Q1293045.ttl*
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Fri, 30 Aug 2013 14:51:55 GMT
*Content-Type: text/turtle*; charset=UTF-8
Content-Length: 8388
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web:http://www.openlinksw.com
Personal Weblog:http://www.openlinksw.com/blog/~kidehen
<http://www.openlinksw.com/blog/%7Ekidehen>
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LinkedIn Profile:http://www.linkedin.com/in/kidehen
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Dipl. Inf. Sebastian Hellmann
Department of Computer Science, University of Leipzig
Events:
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Deadline: *July 18th*)
* LSWT 23/24 Sept, 2013 in Leipzig (http://aksw.org/lswt)
Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
Projects: http://nlp2rdf.org , http://linguistics.okfn.org ,
http://dbpedia.org/Wiktionary , http://dbpedia.org
Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
Research Group: http://aksw.org
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web:http://www.openlinksw.com
Personal Weblog:http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca handle: @kidehen
Google+ Profile:https://plus.google.com/112399767740508618350/about
LinkedIn Profile:http://www.linkedin.com/in/kidehen
--
Dipl. Inf. Sebastian Hellmann
Department of Computer Science, University of Leipzig
Events:
* NLP & DBpedia 2013 (http://nlp-dbpedia2013.blogs.aksw.org, Extended
Deadline: *July 18th*)
* LSWT 23/24 Sept, 2013 in Leipzig (http://aksw.org/lswt)
Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
Projects: http://nlp2rdf.org , http://linguistics.okfn.org ,
http://dbpedia.org/Wiktionary , http://dbpedia.org
Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
Research Group: http://aksw.org
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