Markus, is this related with the idea of creating a database of automatically inferred statements that you presented some time ago?
Cheers, Micru On Tue, Aug 19, 2014 at 12:30 PM, Markus Krötzsch < [email protected]> wrote: > On 19.08.2014 12:20, Gerard Meijssen wrote: > >> Hoi, >> I cannot parse this .. >> > > What Thomas is saying is that classification (putting things into > "categories") and querying (finding things based on certain properties) can > be combined in a natural way. In ontology languages like OWL, you can make > statements that say, roughly speaking, that "all results of query A belong > to class B". This allows you to build a classification partly > automatically, and to ensure that your classification is always consistent > with your data. > > From this perspective, you can view Wikidata's stored queries as similar > to OWL's class expressions in that they allow you to define classes based > on the data given for each item, without having to go through all the items > to add classes manually. What Thomas is referring to is of course slightly > more advanced still, but maybe this clarifies part of the idea. > > Cheers, > > Markus > > > >> On 19 August 2014 11:43, Thomas Douillard <[email protected] >> <mailto:[email protected]>> wrote: >> >> Note that in Wikidata we are developping methods and tools to class >> items in « classes », which in short are sets of real world things >> or events. In languages like the w3c language and standards OWL2 >> <https://en.wikipedia.org/wiki/OWL2>. In this language you can >> >> assign a class to an element (a media in the common case) to a class >> (that can be seen as a better defined category) either by creating a >> statement « this media belongs to that category » (in Wikidata this >> is done by using the « instance of » property >> <https://www.wikidata.org/wiki/Property:P31>) or by associating a so >> >> called «class expression» in OWL (an analog of a query but more >> powerful) Then in OWL any item who satisfy the criteria of the query >> or class expression associated to a class belongs to that class >> without stating it explicitely. In short, the possibility to assign >> an arbitrary class to an item when a query is not enough will also >> be possible with just a metadata repository, we may in the future >> even be able to mix these two ways to class medias. >> >> >> 2014-08-19 10:14 GMT+02:00 James Heald <[email protected] >> <mailto:[email protected]>>: >> >> >> Also there might be queries one might want to run on the >> categories, which would be another reason to include them in >> Commons Wikibase. >> >> -- J. >> >> >> >> On 19/08/2014 07:00, Gerard Meijssen wrote: >> >> Hoi, >> I know the categories in Commons exist. I also know that you >> do not have to >> add categories when an image is uploaded. Many people do not >> consider the >> categories because they are just there and are not easy nor >> obvious without >> a long study. >> >> They are there and they evolve. When the "community" finds >> that they are no >> longer useful, there will be others who still want to work >> on it. They can, >> it is a harmless occupation. Why would we consider removing >> category >> structures as long as someone cares about them ?? >> Thanks, >> GerardM >> >> >> >> _________________________________________________ >> Wikidata-l mailing list >> [email protected] >> <mailto:[email protected]> >> https://lists.wikimedia.org/__mailman/listinfo/wikidata-l >> >> <https://lists.wikimedia.org/mailman/listinfo/wikidata-l> >> >> >> >> _______________________________________________ >> Wikidata-l mailing list >> [email protected] <mailto:[email protected] >> > >> >> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> >> >> >> >> _______________________________________________ >> Wikidata-l mailing list >> [email protected] >> https://lists.wikimedia.org/mailman/listinfo/wikidata-l >> >> > > _______________________________________________ > Wikidata-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikidata-l > -- Etiamsi omnes, ego non
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