Contemplate Affect RSS output

How can I add a node item to my rss output?

this is the normal item i get:

some kind of title

but I want to add extra nodes inside the items:

some kind of title

extra data
< extranode2>extra data
etc etc

if I add stuff in the rss template it becomes available inside the ...
like print $node->images[preview] ...

any help ? :-)