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

inLanguage

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

Thing > Property > inLanguage

The language of the content or performance or used in an action. Please use one of the language codes from the IETF BCP 47 standard. See also availableLanguage.

Usage: Between 250,000 and 500,000 domains
Values expected to be one of these types
Language
Text
Used on these types
CommunicateAction
CreativeWork
Event
LinkRole
WriteAction
Supersedes
language

Schema Version 3.3