xsd:string 2c2, 2c3, 2c3-quater, 2c5-bis, 2c12-undecies, 2c18-bis; 2-quinquies c6, 2-quinquies c7; 2-sexies c1-6, 2-sexies c9-12, 2-sexies c15, 2-sexies c17-20