Postal services – Hybrid Mail – XML definition of encapsulation of letters for automated postal handling; English version CEN/TS 14014:2006
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2006

Postal services – Hybrid Mail – XML definition of encapsulation of letters for automated postal handling; English version CEN/TS 14014:2015
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2015