a question relate to gsxml

[such]

hello, I have problem using it. I am using cvs version and I tried

       GSXMLParser *p;
       GSXMLDocument *d;
       MySAX *h;  // MySAX : GSSAXHandler
       h = [MySAX new];
       p =  [GSXMLParser parserWithSAXHandler:h withData: [@"<?xml 
version=\"1.0\"?><test></test>" dataUsingEncoding: NSUTF8StringEncoding]];

       if ([p parse])
       {
               d = [p document];
               NSLog(@"parse %@",[d version]);
               [d writeToFile:@"test.xml" atomically:YES];

       }
       else
       {
               NSLog(@"error");
       }

but it only show
GSXMLDocument - no data for initialization
parse (nil)

what I did wrong? thanks.