kaldari created this task.
kaldari added a subscriber: kaldari.
kaldari added a project: Wikidata-Query-Service.
Herald added subscribers: StudiesWorld, Aklapper.
Herald added projects: Wikidata, Discovery.
TASK DESCRIPTION
One of the built-in example queries for the Wikidata Query Service is "French
people with an article on the English Wikipedia but not on the French one".
However when you try to run this query, it gives you an error:
QName 'schema:about' uses an undefined prefix
https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%0APREFIX%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0APREFIX%20wikibase%3A%20%3Chttp%3A%2F%2Fwikiba.se%2Fontology%23%3E%0APREFIX%20p%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2F%3E%0APREFIX%20v%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fstatement%2F%3E%0APREFIX%20q%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fqualifier%2F%3E%0APREFIX%20rdfs%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E%0A%0ASELECT%20%3Fitem%20%3FitemLabel%20%28COUNT%28distinct%20%3Fsitelink%29%20as%20%3Fcount%29%20WHERE%20{%0A%20%20%20%3Fitem%20wdt%3AP31%20wd%3AQ5%20.%0A%20%20%20%3Fitem%20wdt%3AP27%20wd%3AQ142%20.%0A%20%20%20%3Fsitelink%20schema%3Aabout%20%3Fitem%20.%0A%20%20%20FILTER%20EXISTS%20{%20%3Fwen%20schema%3Aabout%20%3Fitem%20.%20%3Fwen%20schema%3AinLanguage%20%22en%22%20}%0A%20%20%20FILTER%20NOT%20EXISTS%20{%20%3Fwfr%20schema%3Aabout%20%3Fitem%20.%20%3Fwfr%20schema%3
AinLanguage%20%22fr%22%20}%0A%20%20SERVICE%20wikibase%3Alabel%20{%0A%20%20%20%20bd%3AserviceParam%20wikibase%3Alanguage%20%22fr%2Cen%22%20.%0A%20%20}%0A%20}%20GROUP%20BY%20%3Fitem%20%3FitemLabel%20ORDER%20BY%20DESC%28%3Fcount%29
TASK DETAIL
https://phabricator.wikimedia.org/T117773
EMAIL PREFERENCES
https://phabricator.wikimedia.org/settings/panel/emailpreferences/
To: kaldari
Cc: Aklapper, StudiesWorld, kaldari, jkroll, Smalyshev, Wikidata-bugs,
Jdouglas, aude, Deskana, Manybubbles, Mbch331
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