[Zope] How do reset a dtml-var

Hi, I am trying to check to see if the dtml-var revision is set to a null and if it is I want to set it to "%" as a sql wildcard. This is my test. <dtml-if expr="revision==''"> <p><dtml-var revision>test if1</p> <dtml-let revision="'%'"> <p><dtml-var revision>test if2</p> </dtml-let> <p><dtml-var revision>test if3</p> </dtml-if> Here are my results. test if1 %test if2 test if3 How come the variable is not set after I leave dtml-let statement? Thanks. Larry McDonnell Proton Energy Systems 50 Inwood Rd. Rocky Hill, CT 06067 (860) 571-6533 ext. 531 Email:lmcdonnell@protonenergy.com www.protonenergy.com