XML Editors supporting change tracking (redlining etc.)

All,

An information request to all you XML editor users out there.

What XML editing tools support change tracking (redlining/strikeout/change 
bars and so on)?

I know XMetal does.

I've been told Epic does but don't have first hand info about it.

I believe Frame+SGML/XML does.

Any others?

Sean


http://seanmcgrath.blogspot.com