fixing (just) namespaces and validation

David Megginson david at
Thu Sep 9 15:33:20 BST 1999

Philip Nye writes:

 > This means that in David Megginson's layered model, the document
 > bounces up and down between layers in an inelegant and to my mind
 > very wasteful way, during the course of its processing. This is a
 > result of the inflexibility of the DTD or perhaps of the
 > incompatibility of namespaces.

The only reason for bouncing back to the XML layer is to take
advantage of the fact that it *does* have a widely-implemented schema
language: that's not a design problem with DTDs or Namespaces; it's
just a (very kludgy) workaround because of the fact that the W3C's
schema standards are still under development for the Namespaces layer.

Besides, even if the W3C XML Schema WG released a schema REC tomorrow
(which won't happen), and we all agreed that it was suitable, we
wouldn't necessarily be any better off.  After all, XML-Dev developed
the DDML spec (which would also solve this problem) but no-one has
decided to implement it yet, even though the list's membership
consists almost entirely of developers.  Having a spec is no guarantee
of having implementations.

All the best,


David Megginson                 david at

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