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

about

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

Thing > Property > about

The subject matter of the content.

Usage: Between 10,000 and 50,000 domains

Inverse-property: subjectOf.

Values expected to be one of these types
Thing
Used on these types
CommunicateAction
CreativeWork
Event
Sub-properties
mainEntity

Source

https://github.com/schemaorg/schemaorg/issues/1670

Schema Version 3.3