CategorizationData provides information on how to draw an entity, however systems might want to exchange entities for purposes other than display. Therefore having a CategorizationData type that indicates that the entity is not to be drawn might be useful.

It might be useful to add a custom type so that systems wanting to exchange entities that are not military or ADS-B can define a custom categorization type.

The ADSBCategorizationData class has no attributes which is peculiar. As a consequence there is no struct defined in the IDL and the type is not present in the CategorizationData union.

This should probably either have some attributes added or be removed.

In the DDS/IDL DataPayload PSM struct EntityPayload needs an @key decorator on the entityPayloadBase attribute so that each specialisation is keyed by id