Using Rails 1.1 param parsers



I want to use the new param parsers in Rails 1.1 to process POST’ed xml
data (at the moment I manually parse request.raw_post using REXML). As
Scott R.:

"Pluggable parameter parsers make writable REST web services a cinch.
default, posts submitted with the application/xml content type is
handled by
creating a XmlSimple hash with the same name as the root element of the
submitted XML"

so it sounds like I’m just duplicating parsing that Rails is already

My question is: how do I access the parsed data ? What’s the variable
name ?
I can’t find anything in the ActionController::AbstractRequest docs that
seems to fit the bill

many thanks.