:param representation: A string representation.
        :param media_type: The media type of the representation.
        :param representation_needs_processing: Set to False if the
            'representation' parameter should be used as
            is. Otherwise, it will be transformed from a string into
            an appropriate Python data structure, depending on its
            media type.
        :param representation_definition: A RepresentationDefinition
            object describing the structure of this
            representation. Used in cases when the representation
            isn't the result of sending a standard GET to the
            resource.
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