SDTM Subject domains

“Subject domains” are all the datasets that are about … subjects, i.e. have the “USUBJID” variable in it.
Non-Subject domains are essentially the Trial Design domains. They all start with a “T”. Examples are: TS, TA, TE, TV, …

Hello, I have a question regarding the SDRG completion guideline.

There is a section called ‘SDTM subject domains’ and it is written that ‘The section provides an overview of the subject-related SDTM domains’.

What do they really mean by ‘subject-related domains’ ?So not all of the domains created will be listed there?

Thanks!