With all the news tags you plan on adding (<l>, <seperator>, etc.) how 
do you expect current browsers to render the new tags?
Normally, tags have to be coded INTO the browser by the browser creator 
(ex. microsoft, mozilla, opera, etc.).

How are current browsers suppost to read XHTML 2.0 correctly?  This 
looks like something only future browsers could handle, which would 
cause a problem.