2015-06-08 12:34 GMT+02:00 Eugene Alvin Villar <sea...@gmail.com>:
> Please see the following page for
> the relevant discussion: https://www.wikidata.org/wiki/Help:Sources
>
the second word in this page says you don't need sources for everything
("The majority of statements on Wikidata should be verifiable")
> So in your example, a city can be tagged as being a metropolis if a
> reliable source states so, such as a government economic planning
> office.
>
for obvious reasons "government economic planning offices" are not
independent but following an agenda. How is dealt with different sources
declaring opposite "facts"?
The current situations looks rather different though, most properties of
"Berlin" (the most known one of all Berlins, not the small villages and
towns with the same name), including the "metropolis" "fact", have 0
references, only few have 1 reference, and in some cases this reference is
a wikipedia article: https://www.wikidata.org/wiki/Q64
Interestingly, small, unknown places do not seem to have less references, I
checked for "Breitenholz", a small place nobody is supposed to know, not
even people from southern Germany, where it lies, and it had 3 out of 4
facts documented with references (then I saw that all those references were
from wikipedia): http://www.wikidata.org/wiki/Q906373
Venice, world famous Italian city, had almost no references that weren't
from wikipedia: http://www.wikidata.org/wiki/Q641
Even London does not boast with references for all the facts about it (many
of them from wikipedia), but it has 2 "independent" references to confirm
its "exact coordinates": the Russian and the English wikipedia ;-)
On a sidenote: I was astonished that the reference for the fact that Berlin
is the capital of Germany, was a link to a UN statistical database [1],
rather than a link to the German (actually international because of 2
countries agreeing on the contract) law that defines this:
http://www.gesetze-im-internet.de/einigvtr/art_2.html
[1] http://data.un.org/CountryProfile.aspx?crName=Germany
Given that (AFAIK) the data is mostly imported/derived from wikipedia and
not all content in wikidata is "facts" it seems that the CC-0 license
cannot be safely assumed for the dataset as a whole.
Interestingly, I have seen that London has a reference with the
OSM-relation ID for London. Given that wikidata operates systematically and
seems to copy IDs from OSM (i.e. derivative database or maybe collective
database), wouldn't this imply ODbL for wikidata or at least the OSM-parts
of it? For reference, this is the property:
http://www.wikidata.org/wiki/Property:P402
Cheers,
Martin
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