How to match any string _except_ s1, s2, s3 ?

Question:  How to match any string _except_ s1, s2, s3 ?


In RELAX NG, is there a way to match any string-type
attribute value _except_ an enumerated list of values?

I.e. a _positive_ enumeration, to match either
title="Root" or title="root" might be

<attribute name="title">
  <data type="string">
    <choice>
      <value>Root</value>
      <value>root</value>
    </choice>
  </data>
</attribute>

or

<attribute name="title">
  <data type="string">
    <param name="pattern">[Rr]oot</param>
  </data>
</attribute>

but what if you want to match title="AnyStringHere" but
with the added condition that "AnyStringHere" _not_ be
"root" or "Root"?  One might imagine an <exclude> element, e.g.

<!-- WARNING:  pseudo RELAX NG schema -->
<attribute name="title">
  <data type="string">
    <exclude>
      <value>Root</value>
      <value>root</value>
    </exclude>
  </data>
</attribute>

Or, one could imagine negative pattern matching, e.g.

<!-- WARNING:  pseudo RELAX NG schema -->
<attribute name="title">
  <data type="string">
    <param name="negativePattern">[Rr]oot</param>
  </data>
</attribute>

Is there anything like this available?  Have I missed something?

Ken


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Kenneth R. Beesley		[email protected] 
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