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> Each element has three functions which are used for construction of an
element. These are the <CODE
CLASS="function"
>_base_init()</CODE
> function which
is meant to initialize class and child class properties during each new
child class creation; the <CODE
CLASS="function"
>_class_init()</CODE
> function,
which is used to initialise the class only once (specifying what signals,
arguments and virtual functions the class has and setting up global
state); and the <CODE
CLASS="function"
>_init()</CODE
> function, which is used to
initialise a specific instance of this type.
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