protected void handleCommand(Command command) throws RippleException {
// FIXME: using instanceof is a bit of a hack
if (command instanceof DefinePrefixCmd) {
String prefix = ((DefinePrefixCmd) command).getPrefix();
URIAST uri = ((DefinePrefixCmd) command).getUri();
//...
} else if (command instanceof DefineListCmd || command instanceof RedefineListCmd) {
String name;