Preventing invalid characters from being written to an RSS Feed

Answer 1

Hmm. Looks like this page has a good solution: http://cse-mjmcl.cse.bris.ac.uk/blog/2007/02/14/1171465494443.html

They get the list of valid characters from the XML spec, and just iterate through the string and strip out invalid characters.

Answer 2

Take a look at the Argotic framework for building the RSS feeds. The library handles everything very nicely.