User Import Schema versus USER.DTD

Hello, does someone have the OJS 2.4.x user import SCHEMA.XML file that they can send. Seems that the USER.DTD file is SGML. If I take an export of users, I may or may not get all the definitions that we need. So, I would prefer the base Schema file.

This is all geared towards importing a bunch of conference attendees as subscribers. Is there a way to also mark them for a particular subscription type, eg individual and then the type defined by us?

Many thanks!