Corresponding C++ library: TG_Db 

Contains a localized value and a key that identifies it. The key may be a GUID or the original value. If the value is a GUID 'IsGUID' is true.

Schema: Bentley_Standard_CustomAttributes, Version: 1.13, Class: LocalizationData Available properties: "Key"(string), "Value"(string), "IsGUID"(bool)