On 3/27/17 11:42 AM, Markus Kroetzsch wrote: > On 27.03.2017 15:13, Kingsley Idehen wrote: >> On 3/18/17 6:15 PM, Daniel Kinzler wrote: > ... >> >> Daniel, >> >> I see Wikidata is a collection of reified RDF Statements. I don't see >> how this model differs from RDF's model. It just so happens (in my eyes) >> that Wikidata includes description of statements about things which >> provides rich metadata, in line with the goals of Wikidata. > > Kingsley, > > Wikidata is not a collection of reified RDF statements, but it can > partially be captured by such a collection. There are many ways of > doing this; see [1] for a comparison of some of the more prominent > approaches. All of these encodings can "capture" Wikidata in some way, > but they are not equivalent in terms of RDF or SPARQL. It would > therefore be wrong to claim that any of these possible encodings "is" > Wikidata. > > Different RDF encodings are not only non-equivalent but also behave > very differently in practice. Some queries that work well for one > model are very slow or outright impossible to express in another model > [1]. One can therefore not say that the encoding is just a detail and > that Wikidata somehow "in principle" is RDF anyway. > > This said, the current Wikidata RDF export should serve the needs of > most people who want to work with an RDF toolchain while having access > to most Wikidata content. One cannot get all details from this > projection, but one can do most practically useful things. > > Regards, > > Markus > > [1] Daniel Hernández, Aidan Hogan, Markus Krötzsch > Reifying RDF: What Works Well With Wikidata? > In Thorsten Liebig and Achille Fokoue, eds., Proceedings of the 11th > International Workshop on Scalable Semantic Web Knowledge Base > Systems, volume 1457 of CEUR Workshop Proceedings, 32-47, 2015. > CEUR-WS.org > https://iccl.inf.tu-dresden.de/web/Inproceedings3037
Markus, Let's agree to disagree, for now :) -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Weblogs (Blogs): Legacy Blog: http://www.openlinksw.com/blog/~kidehen/ Blogspot Blog: http://kidehen.blogspot.com Medium Blog: https://medium.com/@kidehen Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/dataspace/person/kidehen#this : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
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