Dear all,

thank you, Dragan for the answer, yet this is nothing I can explain to "normal users". They use the Query Service with the recommended input help and they do get inexplicable January 1st dates (which, if the are not suspicious, they will accept as the new knowledge).

What would speak against a a Query helper that gives data pretty much as we have entered them?

Best,
Olaf





> Dragan Espenschied <dragan.espenschied@rhizome.org> hat am 23.06.2021 19:53 geschrieben:
>
> 
> Hello Olaf,
>
> The trick is to query for the property value node instead of the
> proterty direct value.
>
> Example in ArtBase:
>
> https://tinyurl.com/yft9u5kg
> On Wikidata, you can replace
>   "rt:" --> "wdt:"
>   "rp:" --> "p:"
>   "rpsv:" --> "psv:"
>
> With the "property direct" ("rt") you query for just the value of the
> property.
>
> With "property" ("rp") you query for the node that holds the value, and
> more meta-information about the value.
>
> The node contains the "node value" ("rpsv"), and that value has a
> precision value ("wikibase:timePrecision"). 9 is year level, 10 is
> month level, 11 is day level.
>
> Hope that helps! :)
>
>
>
> select ?artwork ?inception ?date_precision WHERE {
>   ?artwork rt:P3 r:Q5 .
>   ?artwork rt:P26 ?inception .
>
>   ?artwork rp:P26  ?inception_node .
>   ?inception_node rpsv:P26 ?inception_value .
>   ?inception_value wikibase:timePrecision ?date_precision .
>   }
> LIMIT 100
>
>
>
>
>
>
> --
> Dragan Espenschied
> Preservation Director
> Rhizome at the New Museum
>
> On Mi, Jun 23 2021 at 11:50:12 +0200, Olaf Simons
> <olaf.simons@pierre-marteau.com> wrote:
> > Dear All,
> >
> > I wonder whether there is a simple way to retrieve dates with the
> > precision in they have been put into a wikibase.
> >
> > Using SPARQL I get all years such as "1749" as "1 January 1749"
> > statements, no matter whether the person is born that day or not.
> > Should I run different searches?
> >
> > Best,
> > Olaf
> >
> >
> >
> >
> >
> > Dr. Olaf Simons
> > Forschungszentrum Gotha der Universität Erfurt
> > Am Schlossberg 2
> > 99867 Gotha
> > Büro: +49-361-737-1722
> > Mobil: +49-179-5196880
> > Privat: Hauptmarkt 17b/ 99867 Gotha
> > _______________________________________________
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>
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Dr. Olaf Simons
Forschungszentrum Gotha der Universität Erfurt
Am Schlossberg 2
99867 Gotha
Büro: +49-361-737-1722
Mobil: +49-179-5196880
Privat: Hauptmarkt 17b/ 99867 Gotha
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