In wikidata, the absence of a claim about something cannot mean the claim has no couterpart in reality, as Wikidata is an will always be incomplete.
For example if we have a series, maybe finished, maybe unfinished, we wil have claims that says: Episode 2 follows Episode 1 Episode 3 follows Episode 2 ... If for some reason we're sure that the series is other, we can state no value follows Episode 2 Which means "We're sure the series is other". Otherwise this means "Wikidata do not know", for some reason there could be a following episode but noone updated Wikidata yet, for example. 2015-04-23 11:33 GMT+02:00 Gerard Meijssen <gerard.meijs...@gmail.com>: > Hoi, > Sorry for being dense.. What is wrong with there being no value ? Having a > "no value" is imho understanding only a complication of saying nothing... > Why not say nothing in the first place ? > Thanks, > GerardM > > On 22 April 2015 at 21:52, Markus Krötzsch <mar...@semantic-mediawiki.org> > wrote: > >> Hi Thomas, >> >> On 22.04.2015 20:06, Thomas Douillard wrote: >> >>> Hi, there is items about Wikibase data model in Wikidata (created by me, >>> but not only) >>> >>> If I understand correctly, they could be cited in the semantic web as >>> https://www.wikidata.org/entity/Q19798647 >>> >> >> "No value" is exactly that: not a value. It should not be confused with a >> (definite) value that is used with claims (as the item description seems to >> suggest). The reason why we introduced "no value" was to be able to say >> this without resorting to a "special value" to represent this. >> >> You can also find some rationale about this in our article "Wikidata: a >> free collaborative knowledgebase" (see >> https://ddll.inf.tu-dresden.de/web/Article4002/en). Basically, the main >> point is that, if you are querying for two people with a common child, you >> wouldn't want to get pairs of people who both have "novalue" as a value for >> "child". The same is true for "some value" (sometimes referred to as >> "unknown value") -- again, if this would be a definite "special" value, and >> be treated like a value in queries, it would lead to wrong results. >> >> Cheers, >> >> Markus >> >> >>> (If they are kept /o\) >>> >>> Tom² >>> >>> >>> _______________________________________________ >>> Wikidata-l mailing list >>> Wikidata-l@lists.wikimedia.org >>> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >>> >>> >> >> _______________________________________________ >> Wikidata-l mailing list >> Wikidata-l@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> > > > _______________________________________________ > Wikidata-l mailing list > Wikidata-l@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata-l > >
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