Defines properties and message types for DataDrivenExclusiveActivityHost3D.

Inherits properties and message types from ContentLayout3DMetadata, ActivityHostConceptMetadata, ExclusiveActivityHostConceptMetadata, DataDrivenExclusiveActivityHostConceptMetadata.

Message arguments classes define message arguments used for different message types. Each class defines a number of property types - arguments - together with getter and setter functions for them.