> The three frequent workarounds for this issue are:
>
> 1) Use another schema language (Relax NG does this very well)
> instead of
> W3C XML Schema.
>
> 2) Write a laxed schema with W3C XML Schema (most of the time using
> xs:choice/@maxOccurs="unbounded" instead of xs:all) and add Schematron
> rules to do the additional tests.
>
> 3) Wrap all what's hurting W3C XML Schema into container
> elements to fit
> all the restrictions of xs:all.
There's a fourth approach that I've seen:
a) write the Schema using unbounded sequence models for the unordered
elements,
b) perform primary validation of types against the raw schema
c) do a secondary validation of cardinality constraints as defined in
appinfo annotations in the Schema
