Lucas_Werkmeister_WMDE added a comment.
> And
>
> SELECT ?human
> WHERE { ?human wdt:P106 ?o }
>
> Would now mean: //All entities with a known occupation//
> As opposed to //All entities with a known or unkown occupation//
> which should be written as:
>
> SELECT ?human
> WHERE { {?human wdt:P106 ?o} union {?human a wdunk:P106} }
I **strongly oppose** this part. I wasn’t around when the Wikibase RDF model
was designed, so I can’t say whether this was an intentional feature or a happy
design accident (though I suspect it’s intentional), but the fact that
`?subject wdt:P570 ?died` matches both known and unknown values (but not
missing values) is a //very useful feature//, and one that many of my own
queries (and, I suspect, others’ as well) rely on for correctness.
If the problem is just the blank nodes themselves, why not use this new
`wdunk:P2` in the same way, as in `wd:Q3 wdt:P2 wdunk:P2`? That’s still worse
than the blank nodes (multiple “unknown value” statements collapse into one
triple, just as is currently the case for “no value” statements), but at least
it shouldn’t break as many queries.
TASK DETAIL
https://phabricator.wikimedia.org/T244341
EMAIL PREFERENCES
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To: Lucas_Werkmeister_WMDE
Cc: Lucas_Werkmeister_WMDE, Aklapper, dcausse, darthmon_wmde, Nandana, Lahi,
Gq86, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen,
rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, Smalyshev, Wikidata-bugs,
Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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