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The RELAX NG versus XSD competition is bogus, consequently treating one
as the winner and one as the loser at this stage is bogus.
They are both grammar languages, and in many cases you can substitute
one for the other. In fact, it seems that people rarely use the features
in one that are not also not in the other, at least for public schemas.
for a reference to Expressiveness and Complexity of XML Schemas
<http://alpha.uhasselt.be/%7Elucg5503/tods2006.pdf> by Martens, Neven,
Schwentick and Jan Bex which has a lot of material of interest. (You
might even interpret that survey as saying that people are *not* buying
into the exotic parts of XSD. I'd expect the same of RELAX NG.)
People using DTDs, XSD or RELAX NG are all buying into grammars, with
all that entails. I know I have a much more XPath versus grammar
viewpoint than many people, but I think grammars, whether DTD, XSD or
RELAX NG, will play a decreasingly important part in document processing
(perhaps XQuery/XLinq/XSLT2 will cause a momentary hump due to vendors
trying to find markets for their shiny new tools) in the medium term.