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constrainingProperty

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Indicates a property used as a constraint to define a StatisticalPopulation with respect to the set of entities corresponding to an indicated type (via populationType).
Values expected to be one of these types
Integer
Used on these types
StatisticalPopulation

Source

https://github.com/schemaorg/schemaorg/issues/2291