3 Definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 18023-1, ISO/IEC 18023-2, and the following apply.

3.1 inter-transmittal referencing
      ITR

mechanism that allows relationship between objects contained in different transmittals

http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_18023-3_Ed1.html