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I
don't know how far along anyone is, but a combination of the Schematron approach
and
the Schema approach as has been demonstrated by Rick Jeliffe looked very
powerful. Also, I think there was an announcement
that Clark, Jeliffe, Holman et al
were
initiating ISO work to create a combined specification using RelaxNG.
Please any of the above
correct me if I am wrong.
I
tested the Topologi implementation. Regardless of the marketshare, I was
impressed with
the
capabilities when working with a complex schema. It actually caught errors
that were
not
caught by systems with greater market share and was simple to use. I found
that
combining it with a schema editor (XML Spy) was very
productive. I did not pursue
the
combinations of schematron assertions and schema productions very far, but it
appeared to be a good way to go if co-occurrence
constraints were a concern (and
they
usually are when the original model is a relational db).
len
Does anyone out
there use schematron in addition to schema? I am guessing schematron has
about 0.1 % of market share. It looks like an interesting technology we
may use to define some of our document formats that cannot be completely
described in schema.
If path or
semantics dependancies exists in an XML document, I think it is reasonable to
expect clients to validate with schematron if they choose; otherwise,
they can use schema with some custom imperative code (i.e. VB) to verify the
semantic dependancies.
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