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Is this schema constraint possible?

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Consider this XML:

<root>	 <element>		  <foo>CAKE</foo>		  <bar>42</bar>	 </element>	 <element>		  <foo>CAKE</foo>		  <bar>69</bar>	 </element></root>

I want the above XML to be invalid. Is it possible for a schema to require that elements can have duplicate values of "foo" only if they also have duplicate values of "bar"?Or would I have to refactor my data, e.g., specify a set of "foobar" elements and require that my elements above reference them? (I don't know exactly how to do that, either...)

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