Performs any preparations necessary for the Format.

        :param request: The webob Request object describing the
                        request.

        :returns: A list of dictionary values needed by the convert()
                  method.

def prepare(self, request):
        """
        Performs any preparations necessary for the Format.

        :param request: The webob Request object describing the
                        request.

        :returns: A list of dictionary values needed by the convert()
                  method.
        """

        data = []
        for conv in self.conversions:
            data.append(conv.prepare(request))

        return data