Document Item Domain Data definition Datatype Document composition is composed of maps onto is mapped onto Item-to-item mapping is mapped onto is subset of is superset of is equivalent to can be transformed to can be transformed from maps onto (after removing trailing characters) is mapped from (after removing trailing characters) maps onto (after padding with spaces) is mapped from (after padding with spaces) maps onto (after transformation to YYYYMMDD) is mapped from (after transformation to YYYYMMDD) Containing Document Message Item (optional) Message Item (required) Source item Destination item Source document Destination document