Calculated Attributes

Calculated attributes are listed directly within the rule class.

Tip: Within a rule class, there is no meaning attached to the order that calculated attributes are specified. You are free to reorder calculated attributes within a rule class without affecting the behavior of the rule class.

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

    <Initialization>
      <!-- Initialized attributes each contain a type
           but no derivation.

           You should NOT arbitrarily reorder
           initialized attributes. -->
      <Attribute name="firstName">
        <type>
          <javaclass name="String"/>
        </type>
      </Attribute>
      <Attribute name="age">
        <type>
          <javaclass name="Number"/>
        </type>
      </Attribute>
    </Initialization>

    <!-- Each calculated attribute specifies both
         a type and a derivation.

         You are free to arbitrarily reorder
         calculated attributes. -->
    <Attribute name="isAdult">
      <type>
        <javaclass name="Boolean"/>
      </type>
      <derivation>
        <compare comparison=">=">
          <reference attribute="age"/>
          <Number value="18"/>
        </compare>
      </derivation>
    </Attribute>

    <Attribute name="isSeniorCitizen">
      <type>
        <javaclass name="Boolean"/>
      </type>
      <derivation>
        <compare comparison=">=">
          <reference attribute="age"/>
          <Number value="65"/>
        </compare>
      </derivation>
    </Attribute>

  </Class>

</RuleSet>