SAX2: Namespace Processing and NSUtils helper class

[David Brownell]

David Megginson wrote:
> 
> Clark C. Evans writes:
> 
>  > On Sun, 26 Dec 1999 uche.ogbuji at fourthought.com wrote:
>  > >
>  > > {"http://www.w3.org/1999/xhtml", "a", ""} ==
>  > > {"http://www.w3.org/1999/xhtml", "a", "html"}. 
>  >
>  >          {"","a",""} != {"","a","html"}
> 
> As I understood it, the suggestion was that
> 
>   {"", "a", ""} == {"", "a", "html"}

Actually I think the namespace spec defines

    { undeclared, "a", valid-prefix }

as "namespace-nonconformant", AKA some kind of error which they
neglected to describe well enough to support portable APIs.

Meaning that any application choosing to use such a "Name"
class (which IMHO is a fine notion) needs to treat this value
with care ... IEEE floating point math has a variety of sorts
of "NaN" values, perhaps useful models can be found there.
I'd suggest that most "==" tests against such a Name ought to
fail, and ordering tests should cause exceptions.

The issue came up on another namespace thread.

- Dave

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