ops, just found it:

http://docs.jboss.org/drools/release/5.5.0.Final/drools-expert-docs/html_single/index.html#d0e9542

2013/1/21 André Fróes <arfmoraes@gmail.com>

Hello everyone. Is there anywhere I can get a full example of simplest planner implementation, such as nqueens? (apart of example folder)

Thanks