seeking a validator

[Arnold, Curt]

SST asked:

>> A reader asked me if I knew of any software that would let you take an
>> arbitrary SAX stream or DOM tree and validate it against a DTD (heck,
>> multiple DTDs) of the application's choosing, without relying on the
>> DOCTYPE declaration.

I don't have a solution for this problem.  You might be able to intercept or
insert a DOCTYPE event between the SAX and validation layer in one of the
more layered parsers like IBM's.

But I think I do understand the need the provoked it.  I discussed this a
bit in a comment to the W3C Schema work group
(http://lists.w3.org/Archives/Public/www-xml-schema-comments/1999JulSep/0052
.html) which started as a rant on the recently introduced minAbsoluteValue
and maxAbsoluteValue attributes and then tried to explain the distinction
between schema constraints (hopefully implied by the physical nature of a
system) and application (as in EXE, maybe more appropriately processor)
constraints (based on the limitations of the implementation of an
application).   

For example, a well defined address schema would allow you to express non-US
addresses.  However, it would be useful for an application to say that
beyond the requirements of the schema, it had additional requirements (such
as a US address) and that if the document didn't meet these additional
requirements then it wasn't interested in processing it.


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