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In Schema, how to say "If one element exist, another element must exist"?

From: start_over_now@-----.--- (-.-.)
To: NULL
Date: 9/16/2003 2:17:00 PM
Hello All,

I have the following schema:
...
<xs:element name="data_type_id" type="xs:unsignedShort" />
<xs:element name="data_value" type="xs:anyType" />
...

What I want to do is to specify that "If 'data_value' element exists,
'data_type_id' element MUST exist".

How do I do that?

Thanks very much

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