French XOOPS user br_750 recently published a nice article about inheritance of xoopsForm class. Here is the English translation:

What is inheritance?

Inheritance is a concept specific to Object-Oriented Programming (OOP), to create a new class based on an existing class. The new class "inherits" the properties and methods of the class it inherits from, called "parent" class. The inheriting class is called a "child" class.

This definition is very short and you can enhance your knowledge of object-oriented programming on the Web: