Hi Antoine, On Thu, Oct 31, 2013 at 11:39 AM, Antoine Zimmermann <[email protected]> wrote: > Hello, > > > I have a few questions about how statement qualifiers should be used. > > > First, my understanding of qualifiers is that they define statements about > statements. So, if I have the statement: > > Q17(Japan) P6(head of government) Q132345(Shinzō Abe) > > with the qualifier: > > P39(office held) Q274948(Prime Minister of Japan) > > it means that the statement holds an office, right? > It seems to me that this is incorrect and that this qualifier should in fact > be a statement about Shinzō Abe. Can you confirm this?
If I understand the example correctly then yes I agree with you. Qualifiers are there to qualify a statement. So for example to indicate how a value was measured or from when to when a given statement was true. > Second, concerning temporal qualifiers: what does it mean that the "start" > or "end" is "no value"? I can imagine two interpretations: > > 1. the statement is true forever (a person is a dead person from the moment > of their death till the end of the universe) > 2. (for end date) the statement is still true, we cannot predict when it's > going to end. > > For me, case number 2 should rather be marked as "unknown value" rather than > "no value". But again, what does "unknown value" means in comparison to > having no indicated value? Yes. The difference is that we explicitly state something to not be there or to be there but we don't know more. Example: We know person X had children but we don't know who they were. > Third, what if a statement is temporarily true (say, X held office from T1 > to T2) then becomes false and become true again (like X held same office > from T3 to T4 with T3 > T2)? The situation exists for Q35171(Grover > Cleveland) who has the following statement: > > Q35171 P39(position held) Q11696(President of the United States of > America) > > with qualifiers, and a second occurrence of the same statement with > different qualifiers. The wikidata user interface makes it clear that there > are two occurrences of the statement with different qualifiers, but how does > the wikidata data model allows me to distinguish between these two > occurrences? > > How do I know that: > > P580(start date) "March 4 1885" > > only applies to the first occurrence of the statement, while: > > P580(start date) "March 4 1893" > > only applies to the second occurrence of the statement? > I could have a heuristic that says if two "start date"s are given, then > assume that they are the starting points of two disjoint intervales. But can > I always guarantee this? You can't but this is the best you can do I fear for the moment. Cheers Lydia -- Lydia Pintscher - http://about.me/lydia.pintscher Product Manager for Wikidata Wikimedia Deutschland e.V. Obentrautstr. 72 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. _______________________________________________ Wikidata-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikidata-l
