OK, I did not think it might confuse users, the label needs to be changed.
It's of course not intended to use in statements which have no value, it's
just an attempt to express wikibase data model in Wikidata.
is not Wikibase Data model :)
I changed the label to ensure users would not confuse the items with
the real values ...
2015-04-22 21:52 GMT+02:00 Markus Krötzsch <markus(a)semantic-mediawiki.org>rg>:
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
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