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numConstraints

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > numConstraints

Indicates the number of constraints (not counting populationType) defined for a particular StatisticalPopulation. This helps applications understand if they have access to a sufficiently complete description of a StatisticalPopulation.
Values expected to be one of these types
Integer
Used on these types
StatisticalPopulation

Source

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