It almost feels like someone doesn’t want
Wikidata in there?
Maybe that website is maintained by DBpedia fans? Just
thinking out loud here because DBpedia is very popular in the
academic world and Wikidata a huge threat for that popularity.
Maarten
Op 4 mei 2018 om 17:20 heeft Denny Vrandečić
<vrandecic(a)gmail.com <mailto:vrandecic@gmail.com>> het
volgende geschreven:
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
<pfpschneider(a)gmail.com <mailto:pfpschneider@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}
<https://www.wikidata.org/entity/Q%7BNUMBER%7D>
However, they 303 redirect to
https://www.wikidata.org/wiki/Special:EntityData/Q{NUMBER}
<https://www.wikidata.org/wiki/Special:EntityData/Q%7BNUMBER%7D>
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
<https://www.wikidata.org/wiki/Special:EntityData/Q%7BNUMBER%7D.json>)
or to
turtle
(
https://www.wikidata.org/wiki/Special:EntityData/Q{NUMBER}.ttl
<https://www.wikidata.org/wiki/Special:EntityData/Q%7BNUMBER%7D.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
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