daniel added a comment.
Note that per the data model specification <https://www.mediawiki.org/wiki/Wikibase/DataModel#Quantities>, the unit can be any URI (or rather, any IRI): > The unit specifies a physical quantity that the number refers to. It is represented as a IRI rather than as a String, since a string like "m" might represent different units in different contexts. The value should be meaningful independently of the declaration information for its Property (from which more details about units could possibly be obtained), hence the unit is a full IRI. In practice, this IRI might be the IRI refering to an ItemDescription representing the desired unit, or be taken from a standard vocabulary for units, like QUDT. So any validation that restricts this to Wikidata entities should not be hard coded, since other Wikibase installations may choose to rely on a different vocabulary for units. TASK DETAIL https://phabricator.wikimedia.org/T167565 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: daniel Cc: Lea_Lacroix_WMDE, MisterSynergy, abian, Mbch331, matej_suchanek, Pasleim, PokestarFan, Lydia_Pintscher, Ladsgroup, thiemowmde, daniel, Aklapper, Smalyshev, alaa_wmde, Dinadineke, Nandana, tabish.shaikh91, Lahi, Gq86, GoranSMilovanovic, Soteriaspace, Jayprakash12345, JakeTheDeveloper, QZanden, merbst, LawExplorer, _jensen, rosalieper, Jonas, Wikidata-bugs, aude, TheDJ
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