knowsLanguage
A Schema.org Property
This term is in the "new" area - implementation feedback and adoption from applications and websites can help improve our definitions.
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
Source
https://github.com/schemaorg/schemaorg/issues/1688