RSS Request

I use this site mainly for my DVDs and books, so this request may apply to other areas. I use the RSS feed to keep an offsite backup of my DVDs and Books. Would it be possible to get a feed of just the items that I own and not the ones I want? Or, possibly an easier solution, can you add a field to the XML file that specifies whether an item is in the owned list or wanted list?

The field used to be there but it got removed with the last site change, I've added it back in. This page explains all the rss fields:

www.listal.com/rsshelp