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On 11/14/2017 10:42 AM, Eliot Kimber wrote: Well, I was trying to see how close to the language of Roger's proposed statements as I could get ...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”. 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.Any declarative schema is simply a set of constraints to which instances governed by the schema do or don’t conform. > ...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
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