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- From: "Arnold, Curt" <Curt.Arnold@hyprotech.com>
- To: "'Simon St.Laurent'" <simonstl@simonstl.com>
- Date: Wed, 6 Oct 1999 09:24:55 -0600
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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