Aboylikedave on "Best way to filter XML feed according to user set parameters?"

I wish to display an xml feed (via GET HTTP) on a WordPress page. However, I wish the data to be filtered according to user selected parameters.

As an example, lets say I have an XML feed of CD information. I'd like the user to select 'Genre' and the feed would be filtered accordingly.

Ideally but not essentially I'd like the user setting to be stored.

Could someone suggest at a fairly high level, the ways this might be achieved? I am aware I can use the fetch_feed function but I am unclear of ways to feed user input into the filter.

Thanks