public void registerSpanTagHandler(SpanTagHandler handler){
  handlers.add(handler);
  handlersByCharacterStyle.put(handler.getSupportedCharacterStyle(),handler);
}

public void registerSpanTagHandler ( SpanTagHandler handler ) { handlers . add ( handler ) ; handlersByCharacterStyle . put ( handler . getSupportedCharacterStyle ( ) , handler ) ; }
defines a handler to use for converting a particular characterstyle subclass to a particular xhtml tag structure
