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9.4. Detail of a Rule Element
This example rule has LHS and RHS (conditions and consequence) sections. The RHS is a block of semantic code that will be executed when the rule is activated. The LHS is slightly more complicated as it contains nested elements for conditional elements, constraints and restrictions:
<rule name="simple_rule">
<rule-attribute name="salience" value="10" />
<rule-attribute name="no-loop" value="true" />
<rule-attribute name="agenda-group" value="agenda-group" />
<rule-attribute name="activation-group" value="activation-group" />
<lhs>
<pattern identifier="cheese" object-type="Cheese">
<from>
<accumulate>
<pattern object-type="Person"></pattern>
<init>
int total = 0;
</init>
<action>
total += $cheese.getPrice();
</action>
<result>
new Integer( total ) );
</result>
</accumulate>
</from>
</pattern>
<pattern identifier="max" object-type="Number">
<from>
<accumulate>
<pattern identifier="cheese" object-type="Cheese"></pattern>
<external-function evaluator="max" expression="$price"/>
</accumulate>
</from>
</pattern>
</lhs>
<rhs>
list1.add( $cheese );
</rhs>
</rule>
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