The following three constraint types are currently limited to accepting individual items as parameter values with P2305 ("item of property constraint"), leading to the creation of large, incomplete, and difficult-to-maintain constraints. Allowing the use of P2308 ("class") and P2309 ("relation") as constraint parameters would allow many of these constraints to be smaller, more complete, and easier-to-maintain.

Constraint type: none-of (Q52558054)

Example: This constraint has 33 values of "item of property constraint", which could all be replaced with P2308 = recurring event (Q15275719). This query gives more such constraints.

Constraint type: conflicts-with (Q21502838)

Example: This constraint has 30 values of "item of property constraint", most or all of which could be replaced with P2308 = crime (Q83267) and P2308 = accident (Q171558). This query gives more such constraints.

Constraint type: item-requires-statement (Q21503247)

Example: This constraint has 39 values of "item of property constraint", most of which could be replaced by P2308 = filmmaking occupation (Q4220920). This query gives more such constraints.

In the case of at least one property, the size and number of existing constraints may be causing performance issues: https://www.wikidata.org/wiki/Property_talk:P31#Broken_templates

This task replaces T340761.