[rules-users] Help on using Drools with embedded objects

Hi, I am planning to use Drools - JBoss Rules Engine. My requirement is to disburse mails from my application to different groups based on various criteria. I want to use Drools here. My object structure is as follows: class A{ String B = ""; B b; C c; } Hence Obj A has embedded objects within it, and obj B and C further has embedded objects. class B { String X; Z z; } class Z{ String t; String s; } The decision on sending the mails based on the fields in embedded objects of A. I pass instance of A to Drools Format of drl file: package...; import ..; rule "Test" when $a:A(B(Z(s == "testvalue"))) then $a.setSomething(); update($a); end I wanted to know if this (accessing fields in embedded/child object) is feasible with Drools. I get an error saying "UNable to compile myfile.drl when i try to fo this. Could some one look into this issue and let me know the reason for this ? Thanks -D