XML Schema Question

[charlescook@ukonline.co.uk]

I've unsucessfuly been trying to represent the 
following element in XML Schema. I suspect its 
not possible. Any suggestions? 

The element "value" can contain an element 
called "string" which contains some text:

<value>
  <string>some text</string>
</value>

or "value" can simply contain some text:

<value>some text</value>

No prizes for guessing which XML-based RPC 
protocol this is taken from.

- Thanks, Charles

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