ClassType
DataType
DeleteRule
GeometricType
ObjectType
OrderType
PropertyType
PropertyValueConstraintType
SchemaElementState
enum DeleteRule
  The DeleteRule enumeration specifies the action to take when a delete operation is executed on the class instance at the other end of the relation. () Enumerator:
  DeleteRule_Cascade | Cascade the delete operation to class instances at this end of the relation.
  DeleteRule_Prevent | Prevent the delete operation if there are class instances at this end of the relation.
  DeleteRule_Break | Break the relationship by setting the identifying properties at this end to null values.