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core + bib (Bibliographic Extension): terms relating to books and bibliography.

free

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

Thing > Property > free

A flag to signal that the item, event, or place is accessible for free.

Usage: Between 10 and 100 domains
Values expected to be one of these types
Boolean
Used on these types
PublicationEvent
supersededBy
isAccessibleForFree

Schema Version 3.3