Hi Andy,

You can do that with Schematron for instance, eventually you can just 
embed a rule inside your XML Schema file. Or you can do that with Relax NG.

Note that if you stay with XML Schema you do not need two validations. 
Allow both modulemessage and servermessage after your global element and 
the validation action will validate them, no matter what element you 
have. Then at application level just check that the element matches what 
the message-type attribute specifies.

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com


Andy Street wrote:
> Thanks for the reply.  I assume I don't have any alternatives except 
> validating that portion after the parser runs its schema validation?
> 
> On 4/22/07, *Michael Kay * <mike@s... 
> <mailto:mike@s...>> wrote:
> 
> 
>      >       Is it possible to associate an element name with an
>     attribute using
>     a key/keyref pair?
> 
> 
>     No, it isn't.
> 
>     Michael Kay
>     http://www.saxonica.com/
> 
> 
> 
> 
>