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knowsLanguage

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > knowsLanguage

Of a Person, and less typically of an Organization, to indicate a known language. We do not distinguish skill levels or reading/writing/speaking/signing here. Use language codes from the IETF BCP 47 standard.
Values expected to be one of these types
Language
Text
Used on these types
Organization
Person

Source

https://github.com/schemaorg/schemaorg/issues/1688

Acknowledgement

This term and its definition is based upon the work of The Trust Project.