I'm pretty sure that Wikidata is doing better than 90% of the current bubbles in the diagram.
If they wanted to have Wikidata in the diagram it would have been there before it was too small to read it. :) On Tue, May 1, 2018 at 7:47 AM Peter F. Patel-Schneider < pfpschnei...@gmail.com> wrote: > Thanks for the corrections. > > So https://www.wikidata.org/entity/Q42 is *the* Wikidata IRI for Douglas > Adams. Retrieving from this IRI results in a 303 See Other to > https://www.wikidata.org/wiki/Special:EntityData/Q42, which (I guess) is > the > main IRI for representations of Douglas Adams and other pages with > information about him. > > From https://www.wikidata.org/wiki/Special:EntityData/Q42 content > negotiation can be used to get the JSON representation (the default), other > representations including Turtle, and human-readable information. (Well > actually I'm not sure that this is really correct. It appears that instead > of directly using content negotiation, another 303 See Other is used to > provide an IRI for a document in the requested format.) > > https://www.wikidata.org/wiki/Special:EntityData/Q42.json and > https://www.wikidata.org/wiki/Special:EntityData/Q42.ttl are the useful > machine-readable documents containing the Wikidata information about > Douglas > Adams. Content negotiation is not possible on these pages. > > https://www.wikidata.org/wiki/Q42 is the IRI that produces a > human-readable > version of the information about Douglas Adams. Content negotiation is not > possible on this page, but it does have link rel="alternate" to the > machine-readable pages. > > Strangely this page has a link rel="canonical" to itself. Shouldn't that > link be to https://www.wikidata.org/entity/Q42? There is a human-visible > link to this IRI, but there doesn't appear to be any machine-readable link. > > RDF links to other IRIs for Douglas Adams are given in RDF pages by > properties in the wdtn namespace. Many, but not all, identifiers are > handled this way. (Strangely ISNI (P213) isn't even though it is linked on > the human-readable page.) > > So it looks as if Wikidata can be considered as Linked Open Data but maybe > some improvements can be made. > > > peter > > > > On 05/01/2018 01:03 AM, Antoine Zimmermann wrote: > > On 01/05/2018 03:25, Peter F. Patel-Schneider wrote: > >> As far as I can tell real IRIs for Wikidata are https URIs. The http > IRIs > >> redirect to https IRIs. > > > > That's right. > > > >> As far as I can tell no content negotiation is > >> done. > > > > No, you're mistaken. Your tried the URL of a wikipage in your curl > command. > > Those are for human consumption, thus not available in turtle. > > > > The "real IRIs" of Wikidata entities are like this: > > https://www.wikidata.org/entity/Q{NUMBER} > > > > However, they 303 redirect to > > https://www.wikidata.org/wiki/Special:EntityData/Q{NUMBER} > > > > which is the identifier of a schema:Dataset. Then, if you HTTP GET these > > URIs, you can content negotiate them to JSON > > (https://www.wikidata.org/wiki/Special:EntityData/Q{NUMBER}.json) or to > > turtle (https://www.wikidata.org/wiki/Special:EntityData/Q{NUMBER}.ttl). > > > > > > Suprisingly, there is no connection between the entity IRIs and the > wikipage > > URLs. If one was given the IRI of an entity from Wikidata, and had no > > further information about how Wikidata works, they would not be able to > > retrieve HTML content about the entity. > > > > > > BTW, I'm not sure the implementation of content negotiation in Wikidata > is > > correct because the server does not tell me the format of the resource to > > which it redirects (as opposed to what DBpedia does, for instance). > > > > > > --AZ > > > _______________________________________________ > Wikidata mailing list > Wikidata@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata >
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