[rules-users] accumulate funtion in xml

[Isabelle Hupont]

Hi!

I want to program the following drl rule in xml:

rule "average calculation"
	no-loop true
	when			
		_i : Instance()		
		_average : Double()
				from accumulate(accInst: Instance(),
				        	       average(accInst.value("tend")))
		eval(_average < 20000)				        	    
	then
		_i.setValue("tend",2000);
end


For it, I have implemented the following xml file:

<?xml version="1.0" encoding="UTF-8"?>
<package name="org.prophet.fuzzy" xmlns="http://drools.org/drools-4.0"
    xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-4.0 drools-4.0.xsd">
    <import name="weka.core.*"/>
    <import name="org.prophet.gui.docking.*"/>
    <import name="org.prophet.persistence.*"/>
    <import name="org.prophet.persistence.hibernate.*"/>
    <import name="org.prophet.rules.*"/>
    <import name="org.prophet.*"/>
    <rule name="Rule1">
        <rule-attribute name="no-loop" value="true"/>
        <lhs>
            <pattern identifier="_i" object-type="Instance"/>
            <pattern identifier="_average" object-type="Double">
                <from>
                    <accumulate>
                        <pattern identifier="accInst"
object-type="Instance"/>
                        <external-function evaluator="average"
expression="accInst.value(&quot;tend&quot;)"/>
                    </accumulate>
                </from>
            </pattern>
            <eval>_average &lt; 20000.0</eval>
        </lhs>
        <rhs>
_i.setValue("tend", 2000.0); manageRuleFired("Rule1", null, _i);
modify(_i);</rhs>
    </rule>
</package>

And I have the following error when reading the rule package:

org.drools.rule.InvalidRulePackage: Rule Compilation error _average cannot
be resolved _i cannot be resolved _i cannot be resolved _i__Handle__ cannot
be resolved _i cannot be resolved


I also have tried to replace the xml identifier <pattern> by <column> with
no result. Can you help me, please?


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