If you have an external identifier you often can find the record you want Worldcat can use the lccn property See http://worldcat.org/identities/lccn-n79005597/ That is Wikidata Q7724 <https://www.wikidata.org/wiki/Q7724> that has property P244 lcauth https://m.wikidata.org/wiki/Property:P244 If you check VIAF you see The Wikidata record https://viaf.org/viaf/54154627/ and also Lccn 79005597 https://viaf.org/processed/LC%7Cn%20%2079005597 You can also use the Lccn number and find the Wikidata record https://tools.wmflabs.org/sqid/#/view?find=P244:n79005597 Hope it make sense.... its loosely coupled system and then it maybe is not the best structure..... Regards Magnus Sälgö Stockholm, Sweden 6 mars 2018 kl. 18:15 skrev Ettore RIZZA &lt;ettorerizza(a)gmail.com&gt;om>: 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://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fworldcat.org%2Fidentities%2F&data=02%7C01%7C%7C24ed3d8b41df4df00fc008d58385ecec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559533579975247&sdata=DhHWzrQOoGjvmELLEAEXk49jehINSaIzcaSI2%2F9yWeg%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 _______________________________________________ Wikidata mailing list Wikidata(a)lists.wikimedia.org https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.wik… _______________________________________________ Wikidata mailing list Wikidata(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata

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 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 (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 <http://worldcat.org/identities/>" 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 _______________________________________________ Wikidata mailing listWikidata@lists.wikimedia.orghttps://lists.wikimedia.org/mailman/listinfo/wikidata -- All the best, 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: http://dbpedia.org, http://nlp2rdf.org, http://linguistics.okfn.org, https://www.w3.org/community/ld4lt <http://www.w3.org/community/ld4lt> Homepage: http://aksw.org/SebastianHellmann Research Group: http://aksw.org _______________________________________________ Wikidata mailing list Wikidata(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata

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 &lt;ettorerizza(a)gmail.com <mailto:ettorerizza@gmail.com>>: _______________________________________________ Wikidata mailing list Wikidata(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata

This flow involves human intervention so it is not instant. It can take years.

If Dbpedia has “same as” then Wikidata doesn’t have to duplicate that Sebastian Hellman beats me to my question. Perhaps our points of view are different. From mine, which is that of a data consumer and a network enthusiast, the difference between a simple link and two-way links is huge. I mean, links are cheap and linked data is just about links. Instead of a heavy, complex and often empty federated SPAQL query, it would be enough to ask Wikidata to get the information of DBpedia (I think Wikidata is intended to contain one day all the DBpedia entities). Just as one will be able to query Wikidata one day to know the VIAF ID of any writer. I believe that Wikidata is destined to become a data hub of this kind, but maybe I'm wrong. Best regards, Ettore Rizza 2018-03-06 20:11 GMT+01:00 Sebastian Hellmann &lt;hellmann(a)informatik.uni- leipzig.de>: > Hm, now I am also curious and would like to ask the same question as > Ettore. What is the policy here? > > Viaf has schema.org backlinks, see https://viaf.org/viaf/85312226/rdf.xml > > <schema:sameAs rdf:resource="http://www.wikidata.org/entity/Q80" > <http://www.wikidata.org/entity/Q80>/> > Then it's ok to duplicate? because it is not owl:sameAs? > > All the best, > Sebastain > > > On 06.03.2018 20:01, Magnus Sälgö wrote: > > If Dbpedia has “same as” then Wikidata doesn’t have to duplicate that > > Regards > Magnus Sälgö > Stockholm, Sweden > > 6 mars 2018 kl. 19:49 skrev Ettore RIZZA &lt;ettorerizza(a)gmail.com&gt;om>: > > 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&gt;gt;: > >> 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/Globa >> lFactSync >> <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 >> >> >> _______________________________________________ >> Wikidata mailing listWikidata@lists.wikimedia.orghttps://lists.wikimedia.org/mailman/listinfo/wikidata <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.wikimedia.org%2Fmailman%2Flistinfo%2Fwikidata&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=009ZtINq4Vn2yyUJCa13auEnej%2FAbLzA%2BIJt1ogzuTg%3D&reserved=0> >> >> >> -- >> All the best, >> 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: http://dbpedia.org >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdbpedia.org&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=OravJiJyUy%2FLVYoQ5yNQYU0xDcHFH02%2Bp%2BbDWWECHH0%3D&reserved=0>, >> http://nlp2rdf.org >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fnlp2rdf.org&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=m1DRusIhPt%2BtHIC7qkzZVvR2ssCaOart8aPamygKRxI%3D&reserved=0>, >> http://linguistics.okfn.org >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flinguistics.okfn.org&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=ysbEhRyeB22OtS9R05hjeZXUAGp5gMF3zFtPYSNkknE%3D&reserved=0>, >> https://www.w3.org/community/ld4lt >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.w3.org%2Fcommunity%2Fld4lt&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=cr9gVjhIIDJMKyrOFioFOICmwyIui8EqUMdkB6M%2B034%3D&reserved=0> >> Homepage: http://aksw.org/SebastianHellmann >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Faksw.org%2FSebastianHellmann&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991689411&sdata=i7ub%2FNWG6g1iKtDI01T01r%2Fkxuww%2BZbHuuOdM4ZDJJY%3D&reserved=0> >> Research Group: http://aksw.org >> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Faksw.org&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991845679&sdata=9tTgkynNjB2sAwFSWTfQGJD7cPt5vOeVOkTLsRsAjls%3D&reserved=0> >> >> _______________________________________________ >> Wikidata mailing list >> Wikidata(a)lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata >> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.wikimedia.org%2Fmailman%2Flistinfo%2Fwikidata&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991845679&sdata=x1rQozrTo277ACWslPrvu9w86hGDew1RbmyKgvcK%2BfU%3D&reserved=0> >> >> > _______________________________________________ > Wikidata mailing list > Wikidata(a)lists.wikimedia.org > https://nam02.safelinks.protection.outlook.com/?url=https% > 3A%2F%2Flists.wikimedia.org%2Fmailman%2Flistinfo%2Fwikidat > a&data=02%7C01%7C%7Cb20d7c5a98504fcaa29e08d583930f50%7C84df9 > e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559589991845679& > sdata=x1rQozrTo277ACWslPrvu9w86hGDew1RbmyKgvcK%2BfU%3D&reserved=0 > > > > _______________________________________________ > Wikidata mailing listWikidata@lists.wikimedia.orghttps://lists.wikimedia.org/mailman/listinfo/wikidata > > > -- > All the best, > 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: http://dbpedia.org, http://nlp2rdf.org, > http://linguistics.okfn.org, https://www.w3.org/community/ld4lt > <http://www.w3.org/community/ld4lt> > Homepage: http://aksw.org/SebastianHellmann > Research Group: http://aksw.org > > _______________________________________________ > Wikidata mailing list > Wikidata(a)lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata > >