If Dbpedia has “same as” then Wikidata doesn’t have to
duplicate that
information.... you can ask dbpedia what is same as Q7724
Regards
Magnus Sälgö
Stockholm, Sweden
6 mars 2018 kl. 19:49 skrev Ettore RIZZA <ettorerizza(a)gmail.com
<mailto:ettorerizza@gmail.com>>:
First of all, thank you all for your answers.
@Magnus and Thad: it's a bit what I suspected. Since the URL to
WorldCat can be rebuilt from the Library of congress authority ID, I
guess someone thought it would be a duplicate.
But 1) I'm not sure that there is a 1 to 1 mapping between all
Worldcat Identities and the Library of Congress 2) It would be rather
strange that a Library of Congress ID would also serve as an ID for a
"competitor" (ie OCLC, which maintains Worldcat and VIAF) 3) One
would then wonder why Wikipedia provides both links to the Library of
Congress Authority ID and Worldcat Identities.
With respect for the fact that Wikidata already contains links to
VIAF and that VIAF contains links to Worldcat Identities, this
transitivity reasoning could apply to many other Authority IDs, I think.
@Sebastian: Il would be great! I'll follow this project closely, just
as I'm already following your papers
<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcontent.iospress.com%2Farticles%2Fsemantic-web%2Fsw277&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=R1LeZSVSLmdZ%2FiJh6evIwrukAgtQQhzz7OxrJNL%2FXVg%3D&reserved=0>.
And it is precisely because I know that there is a desire for
"rapprochement" on both sides that I asked why there is absolutely
nothing in Wikidata that links to DBpedia (or Yago), whereas DBpedia
contains a lot of owl: sameAs to Wikidata. All this must have been
discussed somewhere I suppose. Still, I do not even find a property
proposal for "DBpedia link".
2018-03-06 18:59 GMT+01:00 Sebastian Hellmann
<hellmann(a)informatik.uni-leipzig.de
<mailto:hellmann@informatik.uni-leipzig.de>>:
Hi Ettore,
we just released a very early prototype of the new DBpedia:
http://88.99.242.78/hdt/en_wiki_de_sv_nl_fr-replaced.nt.bz2
<https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2F88.99.242.78%2Fhdt%2Fen_wiki_de_sv_nl_fr-replaced.nt.bz2&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=oml9kGY8ikCsVFH0jmSFx3txDjQGyT6lj%2FSxangnIZM%3D&reserved=0>
I attached the first 1000 triples. The data is a merge of
Wikidata + 5 DBpedias from the 5 largest Wikipedia versions.
Overall, there are many issues, but we have a test-driven data
engineering process combined with Scrum and biweekly releases,
next one is on March 15th. The new IDs are also stable by design.
We discussed how to effectively reuse all technologies we have
for Wikidata and also Wikipedia and are applying with this
project at the moment:
https://meta.wikimedia.org/wiki/Grants:Project/DBpedia/GlobalFactSync
<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmeta.wikimedia.org%2Fwiki%2FGrants%3AProject%2FDBpedia%2FGlobalFactSync&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=cOIU%2FCe93h%2Ft4b1PdIDhMJWL%2FZB2XKnere%2BulFSZAFE%3D&reserved=0>
(Endorsements on the main page and comments on the talk page are
welcome).
We really hope that the project gets accepted, so we can deploy
the technologies behind DBpedia to the Wikiverse, e.g. we found
over 900k triples/statements with references in the English
Wikipedia's Infoboxes alone.
We still have to do documentation and hosting of the new
releases, but then it would indeed be a good time to add the
links to DBpedia, if nobody objects. Also some people mentioned
that we could load the DBpedia Ontology into Wikidata to provide
an alternate class hierarchy. In DBpedia we loaded 5 or 6
classification schemes (Yago, Umbel, etc.), which are useful for
different kind of queries.
All the best,
Sebastian
On 06.03.2018 18:14, Ettore RIZZA wrote:
Dear all,
I asked myself a series of questions about the links between
Wikidata and other knowledge/data bases, namely those of OCLC
and DBpedia. For example:
- Why Wikidata has no property "Worldcat Identities
<https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fworldcat.org%2Fidentities%2F&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=Bx%2FA%2BPh9nQzNuzrRgRg5dC3s%2BJeKKWNGKUSRguq4Ks4%3D&reserved=0>"
while the English edition of Wikipedia systematically mentions
this identity (when it exists) in its section "Autorithy
control" ?
- Why do VIAF links to all editions of Wikipedia, but not
(simply) to Wikidata ?
- Why is there no link to DBpedia when the opposite is true ?
These questions may seem very different from each other, but
they ultimately concern a common subject and are all very basic.
I suspect they had to be discussed somewhere, maybe at the dawn
of Wikidata. However, I find nothing in the archives of this
Newsletter, nor in the discussions on Wikidata.
Could someone point me to some documentation on these issues ?
Cheers,
Ettore Rizza
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Sebastian Hellmann
Director of Knowledge Integration and Linked Data Technologies
(KILT) Competence Center
at the Institute for Applied Informatics (InfAI) at Leipzig
University
Executive Director of the DBpedia Association
Projects:
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Research Group:
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