Rails - Nov 2007 - formats available for controller

Hello,

I was wondering if there is any way to retrieve the list of formats
defined in the respond_to block of a controller?

For example if the following is in a controller:

    respond_to do |format|
      format.html
      format.xml { render :xml => @people.to_xml }
    end

Is there a way to find out HTML and XML are available? I want to write
a method that creates an XML list of all formats available for any
given controller.

Cheers,
Stephanie
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