Proposed XHP extensions

[Noel Grandin]

Hi

Seems like a nice idea in general.

Just a couple of notes:

> <paragraph role="tip" id="123456" xml-lang="en-US" localize="true">
> 

Should localize=true not just be the default? so it only needs to be specified for the occasional chunk of text that is 
lanuage-neutral?

Similarly, should xml-lang="en-US" not just be specified in some tag near the root of the document, and everything else 
inherits that setting?

Perhaps these are already in place, and I just didn't see it - either way, keep up the good work!

Regards, Noel