On 08.09.2015 17:52, Miguel wrote:
Great news!
I see that the UI uses a public (and CORS-enabled)SPARQL endpoint
available at
https://query.wikidata.org/bigdata/namespace/wdq/sparql
I don't see this SPARQL endpoint documented as such, but I hope it will
be kept publicly available.
Indeed, I should have given some more documentation -- details in this
email. The endpoint you found is documented here:
https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual
If it should ever change, I am sure WMF can set up a redirect to keep
links working.
I also should have pointed explicitly to the list of current example
queries. You can do some very interesting things with this data (and
with SPARQL, of course ;-), but some may not be obvious if you are not
familiar with our data:
https://www.mediawiki.org/wiki/Wikibase/Indexing/SPARQL_Query_Examples
Short guideline for getting started with simple queries:
* Use wd:Q1234 (<http://www.wikidata.org/entity/Q1234>) to refer to an
item ("data page") on Wikidata. You can find an item id, e.g., by
browsing Wikipedia and clicking the link "Wikidata item" on the left.
* Use wdt:P1234 (<http://www.wikidata.org/prop/direct/P1234>) to refer
to *simplified* direct versions of Wikidata properties. Property ids can
be searched for on Wikidata, or browsed for by clicking property names
on any item page.
"Simplified" means that there is a direct connection from subject to
property value -- no references (provenance), no qualifiers (statement
annotations); that the value is simplified (e.g. no precision
information for numbers); and that only data for the statements of the
highest rank will be included (e.g., only current population numbers, no
historic ones).
* For how to access the full data with all details, see the example
query for "largest cities with a female mayor" and read the documentation:
https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format
It also helps to look at some Wikidata pages to get an idea of what is
there. The showcase items give a good overview:
https://www.wikidata.org/wiki/Wikidata:Showcase_items
Cheers,
Markus
Il giorno mar 8 set 2015 alle ore 05:28 Olivier Rossel
<[email protected] <mailto:[email protected]>> ha scritto:
Brillant!!!
Envoyé de mon iPhone
Le 8 sept. 2015 à 10:03, Markus Kroetzsch
<[email protected]
<mailto:[email protected]>> a écrit :
> Dear SPARQLers,
>
> The Wikimedia Foundation has just announced its first official
live query service for Wikidata, based on SPARQL.
>
> Cheers,
>
> Markus
>
>
> -------- Forwarded Message --------
> Subject: [Wikidata] Announcing the release of the Wikidata
Query Service
> Date: Mon, 7 Sep 2015 15:29:02 -0700
> From: Dan Garry <[email protected]
<mailto:[email protected]>>
> Reply-To: Discussion list for the Wikidata project.
> <[email protected] <mailto:[email protected]>>
> To: [email protected]
<mailto:[email protected]>
>
>
>
> The Discovery Department at the Wikimedia Foundation is pleased to
> announce the release of the Wikidata Query Service
> <https://www.mediawiki.org/wiki/Wikidata_query_service>! You can find
> the interface for the service at https://query.wikidata.org.
>
> The Wikidata Query Service is designed to let users run queries
on the
> data contained in Wikidata. The service uses SPARQL
> <https://en.wikipedia.org/wiki/SPARQL> as the query language. You can
> see some example queries in the user manual
> <https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual>.
>
> Right now, the service is still in beta. This means that our goal
>
<https://www.mediawiki.org/wiki/Wikimedia_Engineering/2015-16_Q2_Goals#Wikidata_Query_Service>
is
> to monitor of the service usage and collect feedback about what
people
> think should be next. To do that, we've created the Wikidata Query
> Service dashboard <https://searchdata.wmflabs.org/wdqs/> to track
usage
> of the service, and we're in the process
> <https://phabricator.wikimedia.org/T111403> of setting up a feedback
> mechanism for users of the service. Once we've got monitored the
usage
> of the service for a while and got user feedback, we'll decide on
what's
> next for development of the service.
>
> If you have any feedback, suggestions, or comments, please do send an
> email to the Discovery Department's public mailing list,
> [email protected]
<mailto:[email protected]>
> <mailto:[email protected]
<mailto:[email protected]>>.
>
> Thanks,
> Dan
>
> --
> Dan Garry
> Lead Product Manager, Discovery
> Wikimedia Foundation
>
>
> <Attached Message Part>
--
Markus Kroetzsch
Faculty of Computer Science
Technische Universität Dresden
+49 351 463 38486
http://korrekt.org/
