The datalog example uses backward chaining

The forward chaining version of the case must provide more data types of which facts are generated by rules in order to activate another rules.

It is necessary to set fact duplication to false (set-fact-duplication FALSE) in order to avoid rematching rules riskBrancher1 and riskBrancher2

Jess does not allow for using '(range)' construct within slot definition - the domain of slots can be set by using (allowed-values). However listing of all values from range e.g. [18, 120] is inefficient.

Jess does not allow for fact duplication - such behavior is necessary for this model.

Drools allows for fact duplication default. Thus rules riskBrancher1 and riskBrancher2 requires additional condition that checks if a given Rating/MatchingAssessor already exists:

rule "riskBrancher1"
when
  	RiskBrancher($clientname : Client, $risklevel : RiskLevel)
  	LoanRequest(Client == $clientname, $amountask : AmountAsk, AmountAsk < $risklevel)
  	not(MatchingAssessor(Client == $clientname, AmountAsk == $amountask))
then
  	insert(new MatchingAssessor($clientname, $amountask));
  	//System.out.println("For client " + $clientname + ": The asked amount is less than risk level: asked = " + $amountask + ", risk = " + $risklevel);
end
 
 
rule "riskBrancher2"
when
  	RiskBrancher($clientname : Client, $risklevel : RiskLevel, $ratingmin : RatingMin)
  	LoanRequest(Client == $clientname, $amountask : AmountAsk, AmountAsk >= $risklevel)
  	not(RatingAssessor(Client == $clientname, AmountAsk == $amountask, RatingMin == $ratingmin))
then
  	insert(new RatingAssessor($clientname, $amountask, $ratingmin));
  	//System.out.println("For client " + $clientname + ": The asked amount is greater or equal than/to risk level: asked = " + $amountask + ", risk = " + $risklevel);
end