Information technology — SEDRIS —
Part 3: Transmittal format binary encoding
For the purposes of this document, the terms and definitions given in ISO/IEC 18023-1, ISO/IEC 18023-2, and the following apply.
mechanism that allows relationship between objects contained in different transmittals
http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_18023-3_Ed1.html