From: "Kasimir Gabert" kasimir.g@gmail.com

You probably want to add a purge tab on the top of every article, and if an article with dynamic content expires then a user may press "purge".

Better yet, if you KNOW you have dynamic content -- as in an extension -- you can add page-cache-nullifying PHP code to the extension itself. If you can't find it by searching the archives, let me know, and I'll try to dig it up for you. I verified it with a "fortune" extension that runs the UNIX fortune(1) program each time the extension is invoked.

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