Lucas_Werkmeister_WMDE added a comment.
Hm, maybe it’s possible in SPARQL after all. I think adding this snippet for
each separator property ID ought to be equivalent to the `MainSnakContext`
methods (in particular `haveSameQualifiers`):
MINUS {
?statement pq:$separator ?qualifier.
MINUS {
?otherStatement pq:$separator ?qualifier.
}
}
MINUS {
?otherStatement pq:$separator ?qualifier.
MINUS {
?statement pq:$separator ?qualifier.
}
}
MINUS {
?statement a wdno:$separator.
MINUS {
?otherStatement a wdno:$separator.
}
}
MINUS {
?otherStatement a wdno:$separator.
MINUS {
?statement a wdno:$separator.
}
}
That is, if the current statement has a non-“no value” qualifier and the
other statement doesn’t have the same qualifier, or vice versa, or the current
statement has a “no value” qualifier and the other statement doesn’t, or vice
versa, then the statements are considered different, are not returned from the
query, and don’t generate a violation. (“Unknown value” is always considered to
be different from other “unknown value”, both in the query service and in the
constraints extension, so an “unknown value” qualifier automatically means the
statement is separated from all other statements, which is what we want.)
I haven’t tested this query yet; in particular, we’d need to make sure if
nested `MINUS` works this way. Or maybe use `FILTER NOT EXISTS` instead.
I guess the second half, for “no value”, could also be:
FILTER(EXISTS { ?statement a wdno:$separator. }
== EXISTS { ?otherStatement a wdno:$separator. })
TASK DETAIL
https://phabricator.wikimedia.org/T277855
EMAIL PREFERENCES
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To: Lucas_Werkmeister_WMDE
Cc: Lucas_Werkmeister_WMDE, Manuel, Esc3300, Moebeus, Nikki, Aklapper,
Invadibot, maantietaja, Akuckartz, Iflorez, alaa_wmde, Nandana, Lahi, Gq86,
GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Agabi10,
Scott_WUaS, abian, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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