Java HTML/XML - 如何按id获取值

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.xml.sax.InputSource;

public class Main {

  public static final String xml = //
  "<queries>"//
      + "  <query id='getUserByName'>"//
      + "    select * from users where name=?"//
      + "  </query>"//
      + "  <query id='getUserByEmail'>"//
      + "    select * from users where email=?"//
      + "  </query>"//
      + "</queries>";

  public static void main(String[] args) throws Exception {
    System.out.println(getQuery("getUserByName"));
    System.out.println(getQuery("getUserByEmail"));

  }

  public static String getQuery(String id) throws Exception {
    InputStream is = new ByteArrayInputStream(xml.getBytes("UTF8"));
    InputSource inputSource = new InputSource(is);
    XPath xpath = XPathFactory.newInstance().newXPath();
    return xpath.evaluate("/queries/query[@id='" + id + "']", inputSource);
  }
}