Frank, I am guessing here, the reason "NOT &Firebird=0" does not get evaluated to TRUE is because 0 is not a valid value for a feature state (see http://msdn.microsoft.com/en-us/library/aa368012(VS.85).aspx).
This description from Condition table (http://msdn.microsoft.com/en-us/library/aa368014(VS.85).aspx) has no direct relation to the feature state evaluation, but it shows that in certain situations Windows Installer evaluates invalid expressions to false: "The expression in the Condition column should not contain reference to the installed state of any feature or component. ... Any expression in the Condition table that attempts to check the installed state of a feature or component always evaluates to false. " Sorry, this is the only explanation I can come up with. Alex -----Original Message----- From: Frank Cohen [mailto:frankensp...@gmail.com] Sent: Wednesday, December 31, 2008 12:00 PM To: General discussion for Windows Installer XML toolset. Subject: Re: [WiX-users] Detecting if a feature is marked for install Alex, Thanks for your reply. This did the trick@ I don't completely understand how it works, because shouldn't "NOT &Firebird=0" and "&Firebird=3 OR &Firebird=4" both evaluate to true if they're selected? You make a good point regarding the update and I've removed the "Installed" test. Frank ------------------------------------------------------------------------------ _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users
