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   Re: [xml-dev] Negotiate Out The Noise: (Was RE: SV: SV: [xml-dev] XML=

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Bullard, Claude L (Len) wrote:

> 1.  Laissez-faire:  send only the message. [...]

1a.  Send the schema out of band, just once
(or only when necessary).  Receiver checks the message
against *his* copy of the schema, which represents
his current understanding.  This is what I do
in current XML publishing: I claim the message
conforms to a separately published DTD (available
on the Web), but it does not contain a DOCTYPE

> 2.  Schema/DTD travels with message.  [...]

Really, the DTD part of a document is a lot like a checksum:
it guarantees self-consistency, not consistency
with anything else.  Whenever I get an SGML feed,
I always worry that the new document type is
different from the old document type in a way
hidden by the packaged DTD, since there is a new
DTD with each message.

> 3.  Ask the Web:  use RDF or some other expert system 
> what is needed.  Isn't this sort of a dictionary?  It 
> works as long as you own or accept the ontology of 
> others.  This is Trust and Verify.  Advantages?

This is the same as your case 4 (Java), but using a
declarative language rather than a procedural one.

Not to perambulate             || John Cowan <jcowan@reutershealth.com>
    the corridors               || http://www.reutershealth.com
during the hours of repose     || http://www.ccil.org/~cowan
    in the boots of ascension.  \\ Sign in Austrian ski-resort hotel


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