I think this is mostly a question for Neil...

What are the advantages and disadvantages of SXML vs. xexprs? I've googled for 
this, but none of the high-ranked hits attempt to actually catalog their 
relative virtues.

Here's what I can come up with:

namespaces : xexprs don't handle namespaces, right? 

web-server support: Jay's recent changes make the web-server relatively 
representation agnostic, but the built-in methods are there for xexprs and not 
for SXML

parsing : I get the sense that the SXML parser is way more general, but it's 
not clear to me when this is useful.

serialization : I think that SXML serialization produces better results...

entity support: they support it in different ways, right?

representation choices: the SXML choice (@ for attrs) seems less error-prone, 
though the choice of '@' is really unfortunate when I want to abstract using 
the 'at-exp' languages.


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