I am just tickled at how after banging my head on twisting Views into XML atop zen (yes, theming a view in a zen subtheme is a bit different at least in 5.x) and still not getting the desired results, that Views Node Feed, a Views module that produces custom XML, did it in 5 min (ok, 15min, but that's b/c I stopped to read up on bug patches and tell a friend the good news!).
The README.txt included is straightforward, but if you just want your cupcake handed to you, there are some views node feed examples in the issues queue.
Also, rather than modifying 3rd party fla/swf's params for where the feed is coming from (in this case "config.xml"), consider making a drupal URL alias: make the string "config.xml" an alias to ...../node_feed as specified by the node feed module. Great stuff.
