This EMBED issue raises even more bizarre questions for styling - 
context-dependent styling could well be forced to adjust if EMBEDded material 
is considered part of the document tree.  Taking this into account will be an 
interesting challenge that may force me to use some old-style CLASS 
attributes, but we'll see.  CSS will have some problems, but they may be 
surmountable.  XML styling hasn't exactly happened yet, but I hope the 
developers are keeping this in mind.
XDEV sounds like a much-needed idea given the latitude of interpretation 
allowed to applications.  It may also be needed (or need to be extended 
further) given some of the switches we may need for turning on and off these 
SGML features people seem to want included in their parsers.  But maybe we 
_can_ make everyone happy.
Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer (January) / Cookies (February)