This is my first attempt at creating my own RSS feed but I can't seem to make it valid through http://validator.w3.org/feed/check.cgi

The issue is that it doesn't appear like the & character in <link> or <guid>
For example:

http://www.example.com/?mode=viewpage&page=34324

How can I get this to work? I'm feeling very puzzled.

You need to replace all instances of "&" with "&amp;"

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