object class that represents a logical group of data elements and data frames that describe some aspect of the larger object class by which the nested object class is contained

NOTE 1 to entry Nested object classes are used to describe object classes that are contained within another object class and are used for conceptual objects rather than tangible objects.

EXAMPLE A message sign object class might have a nested object class for the messages stored in its library, where each message is described by a number of properties, such as message number, message content, message owner, etc.