JSON

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JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language.

Sample JSON

{
  "data": "The markup of fragment",
  "portlets": [
    {
      "wid": "8759875984237598347",
      "title": "заголовок",
      "mode": "VIEW",
      "state": "NORMAL",
      "content": "The markup of portlet",
    }
  ]
}

Sample JavaScript, where is req.responseText - is the JSON response.

  var data_object = eval("(" + req.responseText + ")");
  alert("data_object.data = " + data_object.data);
  var frag = data_object.data;
  var portlets = data_object.portlets;
  var portletLength = portlets.length;
  for (var i = 0; i < portletLength; i++) {
    document.getElementById("p" + portlets[i].wid + "title").innerHTML = portlets[i].title;
    document.getElementById("p" + portlets[i].wid + "content").innerHTML = portlets[i].content;
  }

Links:

JSON official
JSON in JavaScript
JSON in Java
Generate JSON from XML to use with Ajax
Генерирование JSON из XML для использования с Ajax