Using is_entityclass Functions
List of: Discussion Topic
Subjects: Entity, Model Object
Contents: Application Development Manual

Applications may use functions named is_<entityclass> (where <entityclass> is the name of a class derived from ENTITY) to determine if a given object is a specific type of entity (i.e., a specific class derived from ENTITY). For example the is_ELLIPSE function takes an ENTITY object and returns a logical that indicates if the ENTITY is an ELLIPSE or not.
PDF/APPDEV/04IDOBJ.PDF
HTM/DATA/ACIS/APPDEV/04IDOBJ/0001.HTM