This interface must be implemented in order to call Java code from
an SVG document.
A ScriptHandler instance is called when a 'script' element's 'type'
attribute value is 'application/java-archive' and when the
manifest of the jar file referenced by the 'xlink:href' attribute
contains a 'Script-Handler' entry. The value of this entry must be
the classname of the ScriptHandler to call.
This classes implementing this interface must have a default