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I guess the Internet (Really The WWW) hasn't heard of certification
If those are State agencies, your customer is in trouble and so
is your business model.
From: Thomas B. Passin [mailto:firstname.lastname@example.org]
> At worst, however, schemas encourage a mindset and assumptions
> that are actively harmful when trying to produce scalable, robust,
> interoperable systems.
What Rusty said.
Here are two vingettes from my own experience to underline his point.
- We will be getting xml messages (via JMS) from a state agency - the
state of California, in fact. Their contractor tells us the messages
conform to such-and-such a schema. The schema happens to be one that we
ourselves wrote; it is a draft version of a to-be standard.
But the first documents we get do not validate against the schema, and
unfortunately they are not just simple extensions. In a few places new
structures have made their way into the document. It seems pretty clear
what has happened. Probably the messages originally validated, but then
the contractor found they wanted to make some changes and forgot that
the changes might not be schema-valid.
As Rusty says, that is the world of the internet.