return OEM_ENCODING;
    }

    /**
     * Returns the raw byte representation of this message.
     *
     * @return A <code>byte[]</code> containing the raw message material.
     */
    public abstract byte[] toByteArray();

        return OEM_ENCODING;
    }


    /**
     * Returns the raw byte representation of this message.
     *
     * @return A <code>byte[]</code> containing the raw message material.
     * @throws IOException
     */
    public abstract byte[] toByteArray () throws IOException;