Streetmathematician added a comment.
I have commented elsewhere <https://www.wikidata.org/w/index.php?title=Wikidata%3AProject_chat&type=revision&diff=1528163946&oldid=1528142108>, on the fact that it appears to me to be a very difficult task to collect "classifying Properties", but I'd like to comment here on the technical side: Currently, in the entity view, we group statements based on the datatype of their property values: Most everything goes into Statements, but identifiers go into Identifiers. This proposal appears to be about adding a third group, "Classification", to the top of the list. If we decide that is a good idea, the next question would be how to select which statements go into Classification. The two options I see are to provide a fixed list of such properties in the Wikibase configuration file, or to derive the list of properties from the Wikidata information itself, by classifying properties as "appears in Classification", "appears in Statements", and possibly others. I've looked into the second option and it's straightforward to implement. We need a new StatementGrouper that looks up the Property, finds an "appears in" statement attached to it, and uses it to determine where the statement appears. I think that's a good idea as a generic Wikibase feature. It's a few extra lines of code. As for the first option, that would require a strong, immutable consensus of which parts of the Wikidata ontology are "Classifying" and which aren't, strong enough to justify putting it into the WikiBASE configuration and not deriving it from the WikiDATA database. I don't think such a consensus exists. I think the first option is a bad idea. (//My// vague intuition is that what people want to see as Classification is statements that are true "by definition". That's easy enough to do for some statements: elephants are mammals by taxonomical definition. It's impossible to do for mathematical objects which often have different, nontrivially equivalent definitions (worse, whether or not they're equivalent may depend on the precise flavor of mathematics in use)) TASK DETAIL https://phabricator.wikimedia.org/T295275 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Streetmathematician Cc: Tagishsimon, PKM, Naseweis520, ArthurPSmith, Streetmathematician, Csisc, Ayack, Tpt, MisterSynergy, TomT0m, Salgo60, Mohammed_Sadat_WMDE, Lucas_Werkmeister_WMDE, Manuel, Aklapper, Invadibot, maantietaja, Akuckartz, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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