Attribute use depending on another attribute value

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Hi, 

I just want to know how I would do the following:

 

<root>

  <test type="1" value="1" display="disp"/>

  <test type="2" value="100" />

</root>

 

I want the 'display' attribute to be available for use depending on what the
value for the 'type' attribute is.

 

How can I do this in a XSD (XML schema)??

 

Thanks you in advance  

 

Jan Vosloo | Developer

Tel: +27 21 888 7000 | Fax: +27 21 883 8123