render :kml

kml is an xml format used by Google Maps for specifying a map and markers and other things in the GMap. I have a model Carrier which has_many :addresses. Each Address has the standard fields (address1, address2, city, state, zip) as well as geocode latitude and longitude strings. Is it trivial to render a Carrier's addresses in a kml file? I hope I can include something like this in the carrier controller:

def render_kml(carrier)   @carrier = Carrier.find(carrier)   render :kml => @carrier.addresses end

But I know that I will have to massage the address fields into the kml xml schema.

Does anyone know any tutorials for rendering collections into xml formats?

Thanks in advance!