[rules-users] "contains..."

Folks, I am using MR3, have a situation when Parent has multiple Children, and there is a rule that needs to be fired when parent has a child with certain attribute (active == true) Will need to do something like that : rule when $p : Parent( active == false, children contains Child() [ active == true ] ) then ... register error: inactive parent cannot have active child. end Please advice on correct syntaxes how to do that. Also please keep in mind, I don't want to insert children in facts memory. Thanks, -Sergey ********************** ** LEGAL DISCLAIMER ** ********************** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer.