<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">2015-06-08 12:34 GMT+02:00 Eugene Alvin Villar <span dir="ltr"><<a href="mailto:seav80@gmail.com" target="_blank">seav80@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div id=":20t" class="" style="overflow:hidden">Please see the following page for<br>
the relevant discussion: <a href="https://www.wikidata.org/wiki/Help:Sources" target="_blank">https://www.wikidata.org/wiki/Help:Sources</a></div></blockquote><div><br><br></div><div>the second word in this page says you don't need sources for everything ("The majority of statements on Wikidata should be verifiable")<br><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div id=":20t" class="" style="overflow:hidden">So in your example, a city can be tagged as being a metropolis if a<br>
reliable source states so, such as a government economic planning<br>
office.</div></blockquote></div><br><br><br clear="all"></div><div class="gmail_extra">for obvious reasons "government economic planning offices" are not independent but following an agenda. How is dealt with different sources declaring opposite "facts"?<br></div><div class="gmail_extra">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: <a href="https://www.wikidata.org/wiki/Q64">https://www.wikidata.org/wiki/Q64</a><br><br></div><div class="gmail_extra">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): <a href="http://www.wikidata.org/wiki/Q906373">http://www.wikidata.org/wiki/Q906373</a><br><br></div><div class="gmail_extra">Venice, world famous Italian city, had almost no references that weren't from wikipedia: <a href="http://www.wikidata.org/wiki/Q641">http://www.wikidata.org/wiki/Q641</a><br><br></div><div class="gmail_extra">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 ;-)<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">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: <a href="http://www.gesetze-im-internet.de/einigvtr/art_2.html">http://www.gesetze-im-internet.de/einigvtr/art_2.html</a><br>[1] <a href="http://data.un.org/CountryProfile.aspx?crName=Germany">http://data.un.org/CountryProfile.aspx?crName=Germany</a><br><br></div><div class="gmail_extra">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.<br><br></div><div class="gmail_extra">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: <a href="http://www.wikidata.org/wiki/Property:P402">http://www.wikidata.org/wiki/Property:P402</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Cheers,<br></div><div class="gmail_extra">Martin<br></div><div class="gmail_extra"><br><br></div></div>