Rails - Jun 2006 - CDATA as api_method expected parameter

I''d like to know if there is any way to accept a CDATA block as a
parameter to an ActionWebService API method. I''d like to have
something like this,

class MyAPI < ActionWebService::API::Base
  api_method :test, :expects => [:cdata]
end

The client would pass "<![CDATA[ ...blah blah... ]]>" as the
parameter
to the method, test.

Perhaps I need to specify :string as the expected type and somehow
tell the parsing library to interpret the string as CDATA?