http://wenku.baidu.com/view/85b4c49851e79b89680226c6.html
http://wenku.baidu.com/view/895b8beb998fcc22bcd10d7f.html
http://drools.group.javaeye.com/
http://www.ibm.com/developerworks/cn/java/j-lo-drools-brms/index.html
wm.log example:
http://blog.gmane.org/gmane.comp.java.drools.user/month=20080401/page=13
RuleFlow:
http://www.scribd.com/doc/6699821/Drools-4-
Drools eclipse plugin instruction:
http://docs.redhat.com/docs/en-US/JBoss_Enterprise_BRMS_Platform/5/html/JBoss_Rules_5_Reference_Guide/ch07.html