Have a look here: http://www.jboss.org/drools/documentation.html it contains lots of useful documentation, in particular you probably want to read the Drools Expert (rules engine) documentation as this describes the syntax of the rules and explains stuff in more detail – though you seem to be on the write track with your understanding below. Thomas *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Harshit Bapna *Sent:* 23 September 2010 10:15 *To:* rules-users(a)lists.jboss.org *Subject:* [rules-users] How does drools loads a modified rule ? Hi All, I am new to Rule Engine concept. I am investigating the Drools 5.0 to check if it meets our requirements. Questions: 1. I am not able to find a resource to learn the syntax of drool rules. I have gone through the shopping example in Drools 5.1 examples but not able to get the basics right. $c : Customer() -- what does this mean ? Is it that all objects of type Customer in the working memory are matched are taken one by ones and assigned to c ? $d : Discount( customer == $c ) -- Each discount objects which have the matching customer are assigned to d. How can I debug this process in eclipse ? Please provide a resource where I can learn the drl syntax. Also what are differences in drl when dialect is java and not mvel. 2. How would a rule engine behave when rules are running on the facts and simultaneously the rules are updated in the knowledge base? ------------------------------ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ************************************************************************************** _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users