Relax NG schema to match entity-reference ints?

Question:  Relax NG schema to match entity-reference ints?

I have existing xml files, originally written for DTD validation,
that contain entity-reference integers as attribute values, e.g.
the value of the 'output' attribute in


<key code="0" output="&#xE719;" />
		...	
<key code="126" output="&#x1E;" />

In general, the value of the output attribute can be a list of
integers with values ranging from 0x1 to 0x10FFFF inclusive.

So the question is this: Can I write a Relax NG schema that
matches and constrains the value of these 'output' attributes,
written in this hex-entity-reference form?

I tried the following, which didn't work:

  <define name="Output">
    <attribute name="output">
      <list>
        <zeroOrMore>
          <data type="int">
            <param name="minInclusive">1</param>
            <param name="maxInclusive">111411</param>  <!-- hex 10FFFF -->
          </data>
        </zeroOrMore>
      </list>
    </attribute>
  </define>
  
Jing complains 'error: bad value for attribute "output"' 

Suggestions and corrections would be welcome.

Ken

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Kenneth R. Beesley		ken.beesley At xrce DoT xerox DoT com 
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