Andreas,
That's just not true. You can re-use and remix Wikimedia content as much as
you like. When you say you "can't cite one Wikipedia article as a source in
another", this is also not true, as we see this done in translated articles
in the edit summary. Fortunately Wikipedia articles need sources, so those
are translated along with the rest f the content and are perfectly valid to
take from one project to another. In art history, when we are talking about
paintings, we are all mostly talking about the same sources anyway,
worldwide. This is probably true for most other disciplines as well.

As far as citing goes, the ratio of cited vs. uncited statements in
Wikipedia is probably much greater than in Wikidata, except we can't
measure that. All we measure is the "reference" statement, but there are
lots of sources in various properties and my guess is that most items with
zero statements are early imports that have just not had anyone click on
them yet. When we use images in Wikipedia articles, we do not "cite"
Wikimedia Commons. Indeed, this is exactly the problem we have when we talk
to GLAMs about image donations. The link itself is enough to allow the user
with a few clicks to get at the image information on Commons, where there
is more information, including sources. When I as a Wikipedian use images
of paintings from Commons in a Wikipedia article, I am using multiple
sources for that article, but some of those sources may be from the Commons
image itself, as some of these are particularly well-sourced. When I am
updating the associated Wikidata item, I add all of the sources that I have
found, and for the more famous paintings, others add links from their own
sources, making Wikidata much richer as a source of references than any
single project. As Lydia explained however, not every individual statement
in Wikidata is sourced, though each item may be sourced to multiple
references. This is partially because we lack the tools to easily source
each statement when we update multiple statements at a time, but it is also
because we don't *need* to source obvious statements.

The point is, that publishing on any Wikmedia project, whether it's
Wikipedia, Wikimedia Commons, or Wikidata, is a manually-driven complex
process done by volunteers. It is not and never will be automatic.

Jane

On Sun, Dec 13, 2015 at 4:57 PM, Andreas Kolbe <jayen...@gmail.com> wrote:

> Jane,
>
> The issue is that you can't cite one Wikipedia article as a source in
> another. If, as some envisage, you were to fill Wikipedia's infoboxes with
> Wikidata content that's unsourced, or sourced only to a Wikipedia, you'd be
> doing exactly that, and violating WP:V in the process:
>
> "Do not use articles from Wikipedia as sources. Also, do not use *websites
> that mirror Wikipedia content or publications that rely on material from
> Wikipedia as sources*." (WP:CIRCULAR)
>
> That includes Wikidata. As long as Wikidata doesn't provide external
> sourcing, it's unusable in Wikipedia.
>
> Andreas
>
> On Sun, Dec 13, 2015 at 9:15 AM, Jane Darnell <jane...@gmail.com> wrote:
>
> > Thanks for that essay, Lydia! You said it well, and I especially agree
> with
> > what you wrote about trust and believing in ourselves. I had to laugh at
> > some of the comments, because if you substitute "Wikipedia" for
> "Wikidata"
> > those comments could have been written 3 years ago before Wikidata came
> on
> > the scene.
> >
> > On Sat, Dec 12, 2015 at 10:18 PM, Lydia Pintscher <
> > lydia.pintsc...@wikimedia.de> wrote:
> >
> > > On Thu, Dec 10, 2015 at 9:27 AM, Lydia Pintscher
> > > <lydia.pintsc...@wikimedia.de> wrote:
> > > > That is actually not correct. We have built Wikidata from the very
> > > > beginning with some core believes. One of them is that Wikidata isn't
> > > > supposed to have the one truth but instead is able to represent
> > > > various different points of view and link to sources claiming these.
> > > > Look for example at the country statements for Jerusalem:
> > > > https://www.wikidata.org/wiki/Q1218
> > > > Now I am the first to say that this will not be able to capture the
> > > > full complexity of the world around us. But that's not what it is
> > > > meant to do. However please be aware that we have built more than
> just
> > > > a dumb database with Wikidata and have gone to great length to make
> it
> > > > possible to capture knowledge diversity.
> > >
> > > I've taken the time and written a longer piece about data quality and
> > > knowledge diversity on Wikidata for the current edition of the
> > > Signpost:
> > >
> >
> https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2015-12-09/Op-ed
> > >
> > >
> > > Cheers
> > > Lydia
> > >
> > > --
> > > Lydia Pintscher - http://about.me/lydia.pintscher
> > > Product Manager for Wikidata
> > >
> > > Wikimedia Deutschland e.V.
> > > Tempelhofer Ufer 23-24
> > > 10963 Berlin
> > > www.wikimedia.de
> > >
> > > Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.
> > >
> > > Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg
> > > unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das
> > > Finanzamt für Körperschaften I Berlin, Steuernummer 27/681/51985.
> > >
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