From The Free On-line Dictionary of Computing (19 January 2023):
Netware Directory Services
NDS
<networking> (NDS) Novell, Inc.'s directory services for
Netware, Windows NT, and Unix. The NDS directory
represents each network resource (user, hardware, or
application) as an object of a certain class, where each
class has certain properties. For example, User and Print
Server are object classes and a user has over 80 properties
such as name, login, password, department, and title.
The directory is hierarchical, divided into branches by rules
of containment. A given object can only belong to a given
container (or branch). The rules governing classes,
properties and, rules of containment are known as the
schema.
(2001-03-20)