I Drafted an (unfinished) essay about classification on Wikidata including metamodeling here : https://www.wikidata.org/wiki/Help:Item_classification
Metamodeling seems to me (and has proven to be) convenient in Wikidata. Think that there is a lot of classes, and that regrouping classes with some similarity in metaclasses can have a lot of applications, inlcuding: * tag classes in different ontology with some ''instance of'' <class of this ontology> metaclass to help query the class by intology * regroups class of the same kinds : classes of chemical elements can be regrouped because they all class atom with respect to their atomic numbers. This is what we call a chemical element and is consistent with the definition of chemical element in the corresponding french Wikipedia article. * regroup classes by definition of their instances : for example the laws of a country actually defined implicitely a lot of classes. Those classes can be regrouped using metaclasses like <class defined by french law> * ... 2014-09-25 20:07 GMT+02:00 Benjamin Good <[email protected]>: > Based on the CHEBI ontology perspective, alcohol is a class with > subclasses like 'aromatic alcohol' which has subclasses like 'benzyl > alcohols' which has subclasses like 'methylbenzyl alcohol' and so on. > > These relationships seem worth capturing and subclass seems like a > reasonable way to do it. If not, would another property be better? > > Check out CHEBI here: > http://www.ebi.ac.uk/chebi/advancedSearchFT.do?searchString=alcohol&queryBean.stars=2 > > -Ben > > > > On Thu, Sep 25, 2014 at 10:52 AM, Alain Cuvillier < > [email protected]> wrote: > >> Hi all, >> >> why are both the *subclass of* and *instance of* properties set for the >> ethanol (showcase) item? >> For me ethanol is a single concrete alcohol and it is not a class. There >> is only one ethanol, with a single chemical formula and structure, so only >> the *instance of* property is right for this item ? >> >> https://www.wikidata.org/wiki/Q153 >> >> Thank you >> Alain >> >> >> _______________________________________________ >> 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 > >
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