Mostly, I stalk you using the RSS Reader Panel extension for Mozilla Firefox, which doesn't like it too much when you introduce new fangled features into the RSS XML. It's a bit strict but that's a good thing.
You can get DTDs to validate your RSS XML against (run it through a tool like XML Spy, or write a perl script to do it) but DTDs are fairly limited. Be nice to see an official XML Schema for the various versions but I'm not aware of any...
Paul Clarke's blog - I live in Hythe near Folkestone. Married to Clare + dad to two, I am a full-stack web developr, and I do js / nodejs, some ruby, python, php ect ect. I like pubs, running, eating, home-automation and other diy stuff, history, family tree stuff, Television, squirrels, pirates, lego, + TIME TRAVEL.