System-defined stuffs in DNG

Hello,

Can anyone tell me if there is any document available which lists all the default attributes/types/columns in DNG?
By "System-defined" stuffs, I mean the following.

Artefact Attributes - Artefact Format, Contributor, Created On etc.
Artefact Types - ArtefactFormats, User, Duration etc.
Columns  - ID, Name, Section, Contents, Description etc.
And other default stuffs like link types, artefact types etc.

I can see these default stuffs in DNG after creating a new/empty PA. But are these set of "system-defined" stuffs documented somewhere?  If yes, can you provide the link?

Thanks in advance,