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
peter
idefix merging> curl -I http://www.wikidata.org/wiki/Q52000000
HTTP/1.1 301 TLS Redirect
Date: Tue, 01 May 2018 01:13:09 GMT
Server: Varnish
X-Varnish: 227838359
X-Cache: cp1068 int
X-Cache-Status: int-front
Set-Cookie: WMF-Last-Access=01-May-2018;Path=/;HttpOnly;secure;Expires=Sat, 02
Jun 2018 00:00:00 GMT
Set-Cookie:
WMF-Last-Access-Global=01-May-2018;Path=/;Domain=.wikidata.org;HttpOnly;secure;Expires=Sat,
02 Jun 2018 00:00:00 GMT
X-Client-IP: 199.4.160.88
Location: https://www.wikidata.org/wiki/Q52000000
Content-Length: 0
Connection: keep-alive
idefix merging> curl -I https://www.wikidata.org/wiki/Q52000000
HTTP/2 200
date: Tue, 01 May 2018 01:14:58 GMT
content-type: text/html; charset=UTF-8
server: mw1252.eqiad.wmnet
x-content-type-options: nosniff
p3p: CP="This is not a P3P policy! See
https://www.wikidata.org/wiki/Special:CentralAutoLogin/P3P for more info."
x-powered-by: HHVM/3.18.6-dev
content-language: en
link: </static/images/project-logos/wikidatawiki.png>;rel=preload;as=image
vary: Accept-Encoding,Cookie,Authorization
x-ua-compatible: IE=Edge
backend-timing: D=75094 t=1525107829593021
x-varnish: 754403290 624210434, 194797954 924438274
via: 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1)
age: 29467
x-cache: cp1067 hit/8, cp1068 hit/9
x-cache-status: hit-front
set-cookie: CP=H2; Path=/; secure
strict-transport-security: max-age=106384710; includeSubDomains; preload
set-cookie: WMF-Last-Access=01-May-2018;Path=/;HttpOnly;secure;Expires=Sat, 02
Jun 2018 00:00:00 GMT
set-cookie:
WMF-Last-Access-Global=01-May-2018;Path=/;Domain=.wikidata.org;HttpOnly;secure;Expires=Sat,
02 Jun 2018 00:00:00 GMT
x-analytics: ns=0;page_id=52899665;https=1;nocookies=1
x-client-ip: 199.4.160.88
cache-control: private, s-maxage=0, max-age=0, must-revalidate
set-cookie: GeoIP=US:MA:Woburn:42.49:-71.16:v4; Path=/; secure;
Domain=.wikidata.org
accept-ranges: bytes
idefix merging> curl -I -H "Accept: text/turtle"
https://www.wikidata.org/wiki/Q52000000
HTTP/2 200
date: Tue, 01 May 2018 01:15:52 GMT
content-type: text/html; charset=UTF-8
server: mw1252.eqiad.wmnet
x-content-type-options: nosniff
p3p: CP="This is not a P3P policy! See
https://www.wikidata.org/wiki/Special:CentralAutoLogin/P3P for more info."
x-powered-by: HHVM/3.18.6-dev
content-language: en
link: </static/images/project-logos/wikidatawiki.png>;rel=preload;as=image
vary: Accept-Encoding,Cookie,Authorization
x-ua-compatible: IE=Edge
backend-timing: D=75094 t=1525107829593021
x-varnish: 754403290 624210434, 160015159 924438274
via: 1.1 varnish (Varnish/5.1), 1.1 varnish (Varnish/5.1)
age: 29522
x-cache: cp1067 hit/8, cp1068 hit/10
x-cache-status: hit-front
set-cookie: CP=H2; Path=/; secure
strict-transport-security: max-age=106384710; includeSubDomains; preload
set-cookie: WMF-Last-Access=01-May-2018;Path=/;HttpOnly;secure;Expires=Sat, 02
Jun 2018 00:00:00 GMT
set-cookie:
WMF-Last-Access-Global=01-May-2018;Path=/;Domain=.wikidata.org;HttpOnly;secure;Expires=Sat,
02 Jun 2018 00:00:00 GMT
x-analytics: ns=0;page_id=52899665;https=1;nocookies=1
x-client-ip: 199.4.160.88
cache-control: private, s-maxage=0, max-age=0, must-revalidate
set-cookie: GeoIP=US:MA:Woburn:42.49:-71.16:v4; Path=/; secure;
Domain=.wikidata.org
accept-ranges: bytes
On 04/30/2018 02:53 PM, Lucas Werkmeister wrote:
The real URI (without scare quotes :) ) is not
https://www.wikidata.org/wiki/Q52000000 but
http://www.wikidata.org/entity/Q52000000 – and depending on your Accept
header, that will redirect you to the wiki page, JSON dump, or RDF data
(in XML or Turtle formats). Since the LOD Cloud criteria explicitly
mentions content negotiation, I think we’re good :)
Cheers,
Lucas
On 30.04.2018 23:08, Peter F. Patel-Schneider wrote:
Does it? The point is not just that Wikidata has real pointers to external
resources.
Wikidata needs to serve RDF (e.g., in Turtle) in an accepted fashion. Is
having https://www.wikidata.org/wiki/Special:EntityData/Q52000000.ttl
available and linked to with an alternate link count when the "real" URI is
https://www.wikidata.org/wiki/Q52000000? I don't know enough about this
corner of web standards to know.
peter
On 04/30/2018 01:45 PM, Federico Leva (Nemo) wrote:
Peter F. Patel-Schneider, 30/04/2018 23:32:
Does the way that Wikidata serves RDF
(https://www.wikidata.org/wiki/Special:EntityData/Q52000000.rdf) satisfy this
requirement?
I think that part was already settled with:
https://lists.wikimedia.org/pipermail/wikidata/2017-October/011314.html
More information:
https://phabricator.wikimedia.org/T85444
Federico
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