Documentation

quotes work
other creative work which this work quotes from textually, verbally or lyrically
[create Create a translatable help page (preferably in English) for this property to be included here]
Type “work (Q386724): item must contain property “instance of (P31)” with classes “work (Q386724)” or their subclasses (defined using subclass of (P279)). (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P6166#Type Q386724, SPARQL
Value type “work (Q386724): This property should use items as value that contain property “instance of (P31)”. On these, the value for instance of (P31) should be an item that uses subclass of (P279) with value work (Q386724) (or a subclass thereof). (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P6166#Value type Q386724, SPARQL
Conflicts with “instance of (P31): human (Q5): this property must not be used with the listed properties and values. (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P6166#Conflicts with P31, search, SPARQL
Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P6166#Entity types
Scope is as main value (Q54828448), as qualifier (Q54828449): the property must be used by specified way only (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P6166#Scope, SPARQL

I guess subject type constraint (Q21503250) and value-type constraint (Q21510865) should be not restricted to creative work (Q17537576) (distinct artistic creation such as artwork, literature, music, and paintings).

Rather subject type constraint (Q21503250) and value-type constraint (Q21510865) should be restricted to intellectual work (Q15621286) [or - maybe - written work (Q47461344)].

--Nstrc (talk) 11:48, 1 June 2020 (UTC)Reply

Creative work (Q17537576) is a subclass of intellectual work (Q15621286), which is a subclass of work (Q386724). And a non-written work (such as a speech) may also cite another non-written work. I have changed type constraint (Q21503250) and value-type constraint (Q21510865) from creative work (Q17537576) to work (Q386724). --Neo-Jay (talk) 09:13, 27 September 2021 (UTC)Reply
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