6 June 2021
This is the Document Exchange (DX) address for organisations. As a structure, it is a subtype of an inferred structure “Contact Detail”.
A DX Address has two parts:
DX Number e.g. DX 1234567891
DX Exchange e.g. Manchester 2
The full DX Address in this example would be “DX 1234567891 Manchester 2”. Note also that “DX” may be replaced with “NI” for addresses in Northern Ireland and that “DX” (or “NI”) is followed by a space that is a part of the value.