not

<?xml version="1.0" encoding="UTF-8"?>
<RuleSet name="Example_not"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation=
"http://www.curamsoftware.com/CreoleRulesSchema.xsd">
  <Class name="Person">

    <Attribute name="isLivingInUSA">

      <type>
        <javaclass name="Boolean"/>
      </type>
      <derivation>
        <!-- Note that this not-within-not is somewhat contrived.
 -->
        <not>
          <reference attribute="isLivingOutsideUSA"/>
        </not>
      </derivation>

    </Attribute>

    <Attribute name="isLivingOutsideUSA">
      <type>
        <javaclass name="Boolean"/>
      </type>
      <derivation>
        <not>
          <equals>
            <reference attribute="country"/>
            <String value="USA"/>
          </equals>
        </not>
      </derivation>
    </Attribute>

    <!-- The country in which this person resides. -->
    <Attribute name="country">
      <type>
        <javaclass name="String"/>
      </type>
      <derivation>
        <specified/>
      </derivation>
    </Attribute>

  </Class>

</RuleSet>