Using Caché Objects - InterSystems Documentation

Properties
Property Behavior
The property behavior classes are system classes. You cannot specify or modify property
behavior.
For example, if we define a class Person with three properties:
Class MyApp.Person Extends %Persistent [ClassType = persistent]
{
Property Name As %String;
Property Age As %Integer;
Property DOB As %Date;
}
The compiled Person class has a set of methods automatically generated for each of its
properties. These methods are inherited from the system Property class as well as the data
type class associated with the property. The names of these generated methods are the property
name concatenated with the name of the method from the inherited class. For example, some
of the methods associated with the DOB property are:
Set x = person.DOBIsValid(person.DOB)
Write person.DOBLogicalToDisplay(person.DOB)
where IsValid is a method of the property class and LogicalToDisplay is a method of the
%Date data type class.
48 Using Caché Objects