core + attic (Attic Area): these terms have been either depricated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

valueRequired

Canonical URL: http://schema.org/valueRequired

Thing > Property > valueRequired

Whether the property must be filled in to complete the action. Default is false.

Usage: Fewer than 10 domains
Values expected to be one of these types
Boolean
Used on these types
PropertyValueSpecification

Schema Version 3.2