[rules-users] rule error

Hi, I want to just depict '&&' and 'or' in my rules and did as follows: rule "Update value" no-loop true when $y :Y(name != "") $x: X(status != "") $z : Z( y == $y, x == $X,(status == "yes" or status == "no")) then modify($z){}; end The above does not work. Is it not valid to write as above?? How else can I depict "or" ? relation? rule "Update value" no-loop true when $y :Y(name != "") $x: X(status != "") $z : Z( y == $y, x == $X,(status == "yes" , status == "no")) then modify($z){ setOutput($z)}; end even this does not work. I also want to add all the values specific to this condition and just print them out in my output file. So I tried adding it to a list (which is done by setOutput(). But here I keep getting multiple entries for the same value. For eg. {a,b,c } //are instances of type z They keep getting added again and again. Should it not process input only once???? Please help. Thank you m </pre> <P><hr size=1></P> <P><STRONG><font color=green>Please consider the environment before printing this email.</font></STRONG></P> <P><STRONG>Visit our website at <a href="http://www.nyse.com">http://www.nyse.com</a> <br> ***************************************************************************** <br> Note: The information contained in this message and any attachment to it is privileged, confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to the message, and please delete it from your system. Thank you. NYSE Euronext. </STRONG></P><pre>