import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;

public class Main {
    public static void main(String[] a) throws Exception {
        String xml = "<?xml version='1.0' standalone='yes'?><x/>";
        var r = XMLInputFactory.newInstance().createXMLEventReader(new ByteArrayInputStream(xml.getBytes()));
        var out = new ByteArrayOutputStream();
        var w = XMLOutputFactory.newInstance().createXMLEventWriter(out);
        w.add(r);
        w.close();
        System.out.println(out);
    }
}