Re: [xml-dev] Need a language whiz: An XML Schema "specifies" howdata is

[Thomas Passin <list1@tompassin.net>]

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.

TomP