Inlines in subjectterm elements

Ciao,
this is a follow up of RFE1666938 [1].
I have two questions for the list:
Does the subjectterm need extra  inline markup, for example mathml
markup or general scripts element (sub and super) like the db:term
elements have?
Or eventually could subject
have e.g. a subjectdescription element with inline markup?

[1] [ 1666938 ] Add a description element to subject
https://sourceforge.net/tracker/index.php?func=detail&aid=1666938&group_id=21935&atid=384107

Regards vito
-v