The class is concrete, so ad extensions can be added/removed to campaigns by referring to the id.
[line 151]
[line 145]
AdExtension __construct( [ $id = NULL], [ $AdExtensionType = NULL])
Overridden in child classes as:
the getNamespace( )
array getParameterMap( )
the getXsiTypeName( )
mixed __get( $var $var)
void __set( $var $var, $value $value)