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> What I need are several rules like:
> name = "value1" --> there must be a "subcontent1" with
> "subchoice1a", annother "subcontent1" with "subchoice1b" can occur
> and "subcontent2" can occur.
> I understand your mail that that is not possible to specify such
> constraints in plain schema. Am I correct? Do I always need an
> external rule engine like Schematron or Relax NG for that?
Yes. W3C XML Schema is limited in this regard.