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The DOCTYPE isn't unreliable. The issue is extensiblity
at the level of the instance of the declaration
language. They are of the same type; the type is
extensible. You can get a reliable answer from
using the system identifier as long as what
is at the other end of the locator is a singleton.
That is why the DOCTYPE has both a PUBLIC and
System ID and clearly separates these. But yes,
this is the issue John Cowan brought up about
packaging the DTD with the document; only
inspection enables one to know that no redefinitions
have occurred.
len
-----Original Message-----
From: Bill Lindsey [mailto:bill@b-bop.com]
The internal subset can override parameter entities
and attribute declarations in the DTD.
So if I want to answer a question such as "are these
two documents of the same type?" I'm not going
to get a very reliable answer from just the
DOCTYPE's public or system identifiers. I'd also
need to compare canonicalizations of the internal
subsets.
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