Re: [Hot Topic] Extension and Versioning

The topic is still going on.

See the mail from Norman Walsh on www-tag mailing list
[XMLVersioning-41] Comments and Suggestions on Draft Extensibility 
Finding
http://www.w3.org/mid/OFAF527DE1.9F11FBE0-ON85256FAB.007EB8D5@lotus.com

It's a very interesting mail to read.

[[[
I think it's fair to say that some of the most successful Web 
technologies
have succeeded as much from the ways that they are inflexible as from 
the
ways that they are extensible.  XML, which is arguably a success, had as
one of its original goals: "The number of optional features in XML is to
be kept to the absolute minimum, ideally zero."[6]
]]]

This, for example, goes in the direction of QA WG recommendations. As 
It's not always good to have extensibility and that it's absolutely 
necessary to evaluate the costs and the benefits.