Namespaces hate validation!
cowan at locke.ccil.org
Wed Jan 6 22:33:53 GMT 1999
Murray Maloney wrote:
> Thus validation depends on the existence of a namespace-aware
> processor that can rewrite an XML document as an equivalent
> document with all namespaces declared on the root element
> and with no use of default namespaces or local scoping
> of prefixes.
> And, that processor is undefined and unimplemented.
I suppose eventually someone will have to MOV MOUTH, MONEY.
But not me, not yet.
> Oh, by the way, what do you do about any entities you encounter?
> I mean, when I combine an HTML DTD with a graveyard DTD,
> how do I avoid name collision between general text entities?
> agrave, egrave, igrave, ograve, ugrave
> Now I assume that you will tell me that there is a *simple*
> algorithm for transforming the DTD and/or the instance to
> deal with name collisions.
Now don't mix up two different issues! There is *no* algorithm,
and nobody claims there is, for merging DTDs automatically!
Tim thinks one will eventually be found, about which *I* am
The claim being made here is:
1) a mixed-namespace DTD, and
2) a mixed-namespace instance
(which is WF and namespace-compliant)
that purports to conform to it, and
3) a source of information
about the prefix-to-URI map(s) being used in the DTD,
it is possible by preprocessing
1) the DTD (without the instance, and
2) the instance (without the DTD)
to produce a modified (DTD, instance) pair which will validate
using an ordinary XML validator
if and only if
the original (DTD, instance) pair would validate
using a (nonexistent) namespace-aware validator,
and the resulting modified instance
will be namespace-equivalent to the original instance.
John Cowan http://www.ccil.org/~cowan cowan at ccil.org
You tollerday donsk? N. You tolkatiff scowegian? Nn.
You spigotty anglease? Nnn. You phonio saxo? Nnnn.
Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)
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