7. Mapping of the OBJECT-TYPE macro
The OBJECT-TYPE macro is used to define a type of managed object. It
should be noted that the expansion of the OBJECT-TYPE macro is
something which conceptually happens during implementation and not
during run-time.
For leaf objects which are not columnar objects (i.e., not contained
within a conceptual table), instances of the object are identified by
appending a sub-identifier of zero to the name of that object.
Otherwise, the INDEX clause of the conceptual row object superior to
a columnar object defines instance identification information.