Use object classes to
create new objects with a predefined set of properties and values.
When you create a drawing
object using object classification, properties are set to allowable
values and data is attached. In addition, the object is tagged with
the name of its object class.
For example, if you create
a road using a Road object class, you are prompted to create a normal
polyline. The polyline is created on the Roads layer, has the default
properties for a road, and has the data values specified for a road feature.
After you create a classified
object, you can use the Object Class tab
of the Properties palette to edit
the data associated with the object class.
To create classified
objects, you must have an object class definition file attached
to your drawing. For information on the location of the object class definition
file, consult your CAD Manager.
an object class was defined with a create method of None, or if
it was defined as a base class only, you cannot create an object
using that object class.