[rules-users] Matching items based on values in lists

[cortlander]

I am new to drools and have been struggling with this rule.

$subject: RqTargetType contains a list of RqAttrib objects
$resource: RqTargetType also contains its own list of RqAttrib objects

$subject in a certain role has to be selected based on (attribType ==
"subject", designator == "subject.role", attribValue == "patient")
$subjectId is to be extracted from another attribute (attribType ==
"subject", designator == "subject.id",	$subjectId: attribValue)

We then need to select a resource that has an attribute to match this
$subjectId (attribType == "resource", designator == "resource.patient",
attribValue == $subjectId )
			
Here is the rule I wrote:

rule "Patient Access Rule"
		#conditions
		RqTargetType( $subjectAttribs : rqAttribs )
		RqAttrib (attribType == "subject", designator == "subject.role", 
			attribValue == "patient") from $subjectAttribs	
		RqAttrib (attribType == "subject", designator == "subject.id",
			$subjectId: attribValue) from $subjectAttribs
		
		$resource: RqTargetType( )
		RqAttrib (attribType == "resource", designator == "resource.patient", 
			attribValue == $subjectId ) from $resource.getRqAttribs()
		RqAttribute (attribType == "resource", designator == "resource.id", 
			$resourceId: attribValue ) from $resource.getRqAttribs
	then 
		#actions
		System.out.println( "resource: " + $resourceId );
		System.out.println( "subject: " + $subjectId );
		System.out.println( "Patient Access rule decision: Permit" );
		decisions.add("Permit");
	retract($subject);				
end

I keep on getting "no viable alternative at input" error.
Tried stripping the code so that only the following was left and still got
the error:
		RqTargetType( $subjectAttribs : rqAttribs )
		RqAttrib (attribType == "subject", designator == "subject.role", 
			attribValue == "patient") from $subjectAttribs	
[ERR 101] Line 25:2 no viable alternative at input 'RqTargetType' in rule
"Patient Access Rule"

Then tried this with similar results.
		$subject: RqTargetType()
		$subjectAttrib: RqAttrib (attribType == "subject", designator ==
"subject.role", 
			attribValue == "patient") from $subject.getRqAttribs()
no viable alternative at input '$subject' in rule "Patient Access Rule"

Any help will be much appreciated.
Thank you and have a great day.
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