Mike wrote:
> <foo>
>   <bar/>
>   <bar/>
>   <baz/>
>   <bar/>
> </foo>
> 
> and
> 
> <foo>
>   <baz/>
> </foo>
> 
> would both match
> 
> <xs:element name="foo">
>   <xs:complexType>
>     <xs:all>
>       <xs:element name="bar" minOccurs="0" maxOccurs="unbounded" />
>       <xs:element name="baz" />
>     </xs:all>
>   </xs:complexType>
> </xs:element>
> 
> except of course for the fact that maxOccurs can only be "1" in
> <xs:all>.
> 
> Do you see what I mean?  I want to specify that these particular
> children elements can occur in their parent, in no particular (known
> to the schema) order, each with their own possibly unbounded
> cardinality.  No other types of children can occur, and I want a
> validating parser to keep track of the cardinality of the children to
> ensure they're not happening too (in)frequently.

I believe this isn't possible. Either specify a strict ordering of elements
(xs:sequence), or allow any number of applicable elements (xs:choice with
minOccurs/maxOccurs). Check semantics on the application-side if necessary,
and/or use a more powerful schema definition language. W3C's XML Schema
Definition Language was not designed to define arbitrarily complex
grammars.

> There must be a way to do this, I just can't figure out how.  Any help
> much appreciated!

The fact that you want to do something doesn't yet mean it's possible.

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