Title says it all, the extensibility of XML is one of its myths...

Technically, XML is based on trees which are not the most extensible 
structures (compared to tables or triples). If you extend a tree you are 
  likely to break its structure (and existing applications). I would say 
that trees grow but are not "extended".

This technical limitation has been strengthen by a community which has 
become conservative and any evolution seems deamed to fail.

XML is now legacy. Its users community is screaming against any change 
and its specification body seems paralysed by its structure and the 
diverging interests of its members...

It's probably time to look for the next wave!

Eric
-- 
See you in Seattle.
                                        http://knowledgetechnologies.net/
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Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
http://xsltunit.org      http://4xt.org           http://examplotron.org
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