11.2.3 External Codelists

These specifications are intended for global application. In some instances, a well-known defined list of terms or concepts that may apply in one geographical region may not have relevance elsewhere, or a specific data supplier may have their own view about, for example, occupancy levels should be described and banded. To support some flexibility, in a limited number of cases across the specification as a whole the use of a user-defined external code list is permitted. In each case the specification provides an example code list which may be preferred in a specific region or user community.

Figure 41 provides a structure to define and reference user-defined code lists, and then reference specific entries within a specific code list.

Figure 41 – Classes to support the definition of external user-defined code lists