Mapping objects are required to display segments of the source and target documents. These can be selected and assigned as source or target type in the mapping designer. Mapping objects are preferably created with eBiss Type editor1) Module and for each document that is to be transformed, there is a separate mapping object that has to be set up in a certain class structure. Mapping objects are set up as tree structures. They represent the individual documents (PRICAT, ORDERS, ORDRSP, etc.). These tree structures represent the individual segments and the group structure within the documents.