Using restfulie and custom formats

[Offirmo]

Hello,

I'm planning to use restfulie for my REST interface. It's OK for .json
and .xml, but I also need .csv and a custom XML format (.gexf if you
need to know).

How should I do it correctly ?

I thought about doing something like :
if csv or gexf then
do it manually (still read and respect the tokamak file ?)
else
leave it to restfulie
end

Advices needed please.