[wss] Web Services Security Addendum?

I noticed that on the Microsoft's web site a web services security addendum
has recently
been published.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnglobspec/
html/ws-security-addendum.asp


I appreciate the addendum - particularly since there are numerous parties
contemplating
interoperability and conformance to this spec - even before/during the time
this TC is 
going to review it and possibly revise it towards the goal of an OASIS WSS
standard.

However, in the meantime, I want to find out what do people think w.r.t.
schema changes
that have taken place between the April 2002 version and the (un-announced)
August
2002 version. In particular there no longer seems to be an XSD schema
defintion file,
rather a DTD?

Anyone care to elaborate?

thanks & regards,
Zahid