[dsdl-discuss] Potential use case for datatyping: prefixes

 XML namespaces has lagged behind the times somewhat, because
it is quite common for qualified names ( xxx:yyy ) to appear in
attribute values.

Systems with embedded Xpaths, such as XSLT and Schematron
are of course involved.

One kind of datatyping that might be useful could be
a datatype that says
  "anything that looks like a prefix in this string must be a
  namespace in scope (from xmlns) or defined
  (from something like Schematron's ns elements)"

I don't know whether this is feasible, or how to do it.

And whether to go all the way an cope with, for
example, embedded literals, so that for
  <a x="//xxx:yyy[@string='aaa:bbb']" />
the xxx: would be validated as a prefix
and the aaa: would escape validation.

Another wrinkle on that might be to
nominate a schema that the namespace xxx
resolves to, and then allow verification that yyy
is an element name in it.

Cheers
Rick Jelliffe

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