Some classes are missing from XML-schema

Description

Some classes are not defined in the XSD files - I don't know if it was a specific reason.
This is about:
CONTRIBUTION, EHR, VERSIONED_OBJECT, UID, UUID, VERSIONED_*, VERSION_TREE_ID, TIME_DEFINITIONS
I have however (a) schema for them.

Environment

None

Reporter

Sebastian Iancu

Labels

None

Components

Affects versions

Priority

Minor
Configure