XML : Loop xml and persist to database java

I'm trying to loop through xml and extract values and persist it to mysql using rest . this is what i have so far.But its only extracting the first string that has value songIts adding to the database but id like to add two at a time.

      NodeList artistList = (NodeList)xPath.evaluate("/plist/dict/dict/dict/string[@rollno='artist']", root, XPathConstants.NODESET);          for (int i = 0; i < artistList.getLength(); ++i) {              Element e = (Element) artistList.item(i);              artist= e.getFirstChild().getNodeValue();                  book.setIsbn(artist);              book.setName(song);                    returnCode = "200";              em = Resource.getEntityManager();          }    

This is the xml which i'm trying to parse using xpath i'd like to extract all rollno="song" and persist them one after the other ,any advice or help will mean a lot .Thanks

    <plist version="1.0">     <dict>        <key>Major Version</key>        <integer>1</integer>        <key>Application Version</key>        <string>7.0.2</string>        <key>Show Content Ratings</key>        <true />        <key>Tracks</key>        <dict>           <key>1288</key>           <dict >              <key>Track ID</key>              <integer>1288</integer>              <key>Name</key>              <string rollno="song">Brighter Than Sush</string>              <key>Artist</key>              <string rollno="artist">Aqualug</string>              <key>Album Artist</key>              <string>Aqualung</string>              <key>Album</key>              <key>Track ID</key>              <integer>1288</integer>              <key>Name</key>              <string rollno="song">james</string>              <key>Artist</key>              <string rollno="artist">martha</string>              <key>Album Artist</key>              <string>Aqualung</string>              <key>Album</key>           </dict>            </dict>     </dict>  </plist>