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XPath with JDOM

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This code snippet is copied from http://www.java2s.com/Code/Java/XML/XPathwithJDOM.htm .

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Namespace;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;

public class MainClass {
  public static void main(String[] args) throws Exception {
    Namespace NS_GUEST = Namespace.getNamespace("g", "uri:c:guest");
    Namespace NS_SCHEDULE = Namespace.getNamespace("s", "uri:c:schedule");

    SAXBuilder builder = new SAXBuilder();
    Document document = builder.build(new File("tds_ns.xml"));

    XPath xPath = XPath.newInstance("/s:schedule/s:show[@date=$date]/g:guest");   // HERE
    xPath.addNamespace(NS_SCHEDULE);
    xPath.addNamespace(NS_GUEST);

    String formattedDate = new SimpleDateFormat("MM.dd.yy").format(new Date(2006, 5, 14));
    xPath.setVariable("date", formattedDate);
    Element guest = (Element) xPath.selectSingleNode(document);   // HERE

    System.out.println(guest.getChildText("name", NS_GUEST));
  }
}