Re: XML Schema language version

On Oct 2, 2013, at 2:12 PM, Michael Kay wrote:

> I think it would be a creative but perfectly reasonable interpretation =
of the XSD 1.1 specification to advise users to set vc:minVersion=3D"1.0" =
or vc:minVersion=3D"1.1" or vc:maxVersion=3D"1.0" on the xs:schema =
element to indicate whether they expect to use a 1.0 processor or a 1.1 =
processor for the schema, and for an IDE such as oXygen to use this =
attribute when selecting a processor to run.
>=20
> See http://www.w3.org/TR/xmlschema11-1/#cip


That's an elegant idea, much better than the vague notions that were
floating around in my mind's eye of using the xml-model PI with
a new pseudo-attribute like=20

  version=3D"http://www.w3.org/XML/XMLSchema/v1.0"

or

  version=3D"http://www.w3.org/XML/XMLSchema/v1.1"

I think vc:minVersion and vc:maxVersion are nicer.

To be specific, I think=20

  vc:minVersion=3D"1.0" should be taken to mean a 1.0 or a 1.1
  processor is fine for validations using this schema, but an
  editor like Oxygen should check that the schema document
  uses only 1.0 features, or that any 1.1 features are protected=20
  by an appropriate version-control attribute, like=20
  vc:minVersion=3D"1.1".

  vc:maxVersion=3D"1.0" should mean that ONLY a 1.0=20
  validator should be used for validation, and that no 1.1
  features should be included at all (even with a
  version-control attribute).

  vc:minVersion=3D"1.1" should mean that a 1.1 (or higher, if
  that day were ever to come) processor should be used for
  validation, and that an editor should check that only 1.1
  features are used.

Michael

--=20
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