Title: Re: [ubl] Discussion of substitution groups
If that is by using the version attribute alone
(Note it appears
few tools support the version attribute) then how
would this
information get into instances? If the answer is
that it wouldn't
then I agree with Tony that that would be a serious
concern.
All the best
Steve
----- Original Message -----
From:
CRAWFORD, Mark
To:
Sent: Wednesday, July 20, 2005 11:50
AM
Subject: RE: [ubl] Discussion of
substitution groups
>In transactional messaging, there can be the
risk of legal consequences if
you don't know exactly which version of
a message Schema applies to an
message instance, since each Schema
version is like a different version of
a contract, and you introduce
a business risk of you decide do something
under the terms of a
contract, without checking which version of the
contract actually
applies.
>The upshot is that each message instance really should
identify which
Schema, and which version of that Schema, applies to
it. The most popular
way to do this is to have a unique
namespace for each version of each
Schema. The way I like to do
it, sometimes in addition to the namespace
technique, is to provide
top-level attributes which have a fixed value
that is required to
appear, and which identify the Schema and version.
Sometimes
people try to use the 'schemaLocation' to provide Schema
version
information, but this is a fragile technique that I don't
recommend in
general.
Remember - ATG is just not using minor
versioning of the namespaces. They continue to use minor versioning of
the schema. The namespaces is only a conceptual holder used to
differentiate conflicting
names.
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