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inLanguage

A Schema.org Property
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.
Values expected to be one of these types
Language
Text
Used on these types
BroadcastService
CommunicateAction
CreativeWork
Event
LinkRole
PronounceableText
WriteAction
Supersedes
language

Source

https://github.com/schemaorg/schemaorg/issues/2382