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Re: Need a language whiz: An XML Schema "specifies" howdata is

  • From: Thomas Passin <list1@tompassin.net>
  • To: xml-dev@lists.xml.org
  • Date: Tue, 14 Nov 2017 11:33:46 -0500

Re:  Need a language whiz: An XML Schema "specifies" howdata is
On 11/14/2017 10:42 AM, Eliot Kimber wrote:
At the risk of splitting hairs (ok, at the certain risk of splitting
hairs), I don’t think a schema can be said to “describe how data is
to be structured”.
Well, I was trying to see how close to the language of Roger's proposed statements as I could get ...

Any declarative schema is simply a set of constraints to which
instances governed by the schema do or don’t conform.
I actually see this statement as being essentially equivalent to mine: "... and may be used to constrain that structure" - in the sense that one can use conformation to the schema as a constraint. To me, we are saying much the same thing, but maybe you still see some split hairs.

> ...So a schema, by itself, can only be an incomplete definition of constraints, no more.

Yes, and therefore the interest in using different kinds of validation, like Schematron, to complement an XML Schema.


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