Structure is the abstract class that contains common characteristics, or attributes, for all electric structures involved in the distribution or transmission of electricity. The Structure class was created as a general top-level class for any type of facility structure. The subsystem structure contains nonnetwork (nonspatial) features and related objects. You can create associations between a support structure and the Inspection object class to capture information about maintenance, for example. The subsystem structure also includes objects to manage information about the life cycle of a structure.