LZX is a fully object-oriented language. With object-orientation, you can encapsulate common code in reusable classes. This prevents code duplication and greatly facilitates the maintenance of your applications.

Creating classes with LZX is extremely easy: you use the <class> tag, provide the class with a name, and set a default value for predefined attributes, like in the box example above. You can also define your own attributes, events, and methods, as we will see in the following examples. By creating a class, you automatically define a tag, such as <box> in this example, that you can use anywhere in your application.