By the way: the item "demand <https://www.wikidata.org/wiki/Q4402708>" in Wikidata clearly refers to the economic concept in its broadest and most abstract sense, while https://schema.org/Demand is defined as "the public (...) announcement by an organization or person to seek certain types of goods or services. "
So I would not say they are equivalent classes, but rather something like < https://www.wikidata.org/wiki/Q4402708> <skos:narrower> < https://schema.org/Demand>. As Andra Waagmeetser indicates, could not this be modeled with an external ID? On Wed, 26 Sep 2018 at 10:18, Ettore RIZZA <ettoreri...@gmail.com> wrote: > Hi, > > aggregate demand -- broader external class --> https://schema.org/Demand >> place of devotion -- broader external class --> https://schema.org/Place >> festival -- broader external class --> https://schema.org/Event > > > According to the "creator" of the property narrower external class > (P3950) > <https://www.wikidata.org/wiki/Wikidata:Property_proposal/external_subclass>, > " the reverse (...) is less required because more general classes are > more likely to be included in Wikidata anyway. " > > These examples seem to prove him right, since "demand > <https://www.wikidata.org/wiki/Q4402708>" exists in Wikidata and is > already linked to "http://schema.org/Demand"; via the equivalent class > property. Same thing for https://schema.org/Event, already mapped with > event <https://www.wikidata.org/wiki/Q1656682>, or for > https://schema.org/Place , which could be associated with location > <https://www.wikidata.org/wiki/Q17334923> (not sure). > > To be clear, I support the creation of "broader external class" because it > can be used with some external vocabularies; I point this out just to make > sure that all existing mapping possibilities are used. :) > > Cheers, > > Ettore Rizza > > > On Wed, 26 Sep 2018 at 03:53, Thad Guidry <thadgui...@gmail.com> wrote: > >> Sure, Dan >> >> aggregate demand <https://www.wikidata.org/wiki/Q1801078> -- broader >> external class --> https://schema.org/Demand >> >> place of devotion <https://www.wikidata.org/wiki/Property:P5873> -- >> broader external class --> https://schema.org/Place >> >> festival <https://www.wikidata.org/wiki/Q132241> -- broader external >> class --> https://schema.org/Event >> >> Usually we can discover these relationships quite easily with "What links >> here" on the GUI and applicable SPARQL queries, but then would like to >> apply the Wikidata->Schema.org mappings when we discover those >> relationships can be made. I suck at PHP, so I couldn't build or >> contribute to a native application for Wikidata to host that application to >> auto discover some of these mappings, but would be happy to assist someone >> who could code in PHP to build such application...here's looking at you, >> Magnus ? :-) >> >> -Thad >> +ThadGuidry <https://plus.google.com/+ThadGuidry> >> >> >> On Tue, Sep 25, 2018 at 7:07 PM Dan Brickley <dan...@google.com> wrote: >> >>> On Tue, 25 Sep 2018 at 16:35, Thad Guidry <thadgui...@gmail.com> wrote: >>> >>>> Hi Team ! >>>> +Dan Brickley <dan...@google.com> +Lydia Pintscher >>>> <lydia.pintsc...@wikimedia.de> >>>> >>>> Schema.org mapping is progressing on every new Weekly Summary "Newest >>>> properties" listing. >>>> That's great ! And thanks to Léa and team for providing the new >>>> properties listing ! >>>> >>>> What's not great, is many times, we cannot apply a "broader external >>>> class" to map to a Schema.org Type. This is because "broader concept" >>>> https://www.wikidata.org/wiki/Property:P4900 is constrained to >>>> "qualifiers only and not for use on statements". >>>> >>>> We are able to use the existing "narrower external class" >>>> <https://www.wikidata.org/wiki/Property:P3950> , for example like here >>>> on this topic, https://www.wikidata.org/wiki/Q7406919 , but there is >>>> no "broader external class" property in Wikidata yet from what we see. >>>> >>>> It would be *awesome* if someone could advocate for that new property >>>> to help map Wikidata to external vocabularies that have broader concepts >>>> quite often, such as Schema.org. >>>> >>> >>> Could you give 2-3 specific examples, to help motivate the request, for >>> folk who're not tracking this work? >>> >>> Dan >>> >>> -Thad >>>> +ThadGuidry <https://plus.google.com/+ThadGuidry> >>>> >>>> _______________________________________________ >> Wikidata mailing list >> Wikidata@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata >> >
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