jQuery XMLDocuments and strings
var x_raw = "<?xml version='1.0'?><Q id ='23'><SQ id='201'><GP id='0'></GP></SQ></Q>"
var j_xml = $(x_raw)
.... Code for XML manipulation goes here ....
var x_string = (new XMLSerializer()).serializeToString(j_xml);

var x_raw = "<?xml version='1.0'?><Q id ='23'><SQ id='201'><GP id='0'></GP></SQ></Q>"
var xml = $.parseXML(x_raw);

newNode = xml.createElement("VALUE")
newText = xml.createTextNode("<![CDATA[Whooppeee]]>");

var insert = xml.getElementsByTagName('GP')[0].appendChild(newNode)
insert = insert.appendChild(newText)

var x_string = (new XMLSerializer()).serializeToString(xml);

newText = xml.createTextNode("<![CDATA[Whooppeee]]>")

var x_raw = "<?xml version='1.0'?><Q id ='23'><SQ id='201'><GP id='0'></GP></SQ></Q>"
var xml = $.parseXML(x_raw);
var collection = xml.filter("SQ")

newText = xml.createCDATASection("Whooppeee");

var x_raw = "<?xml version='1.0'?><Q id ='23'><SQ id='201'><GP id='0'></GP></SQ></Q>"
var xml = $.parseXML(x_raw);
var collection = xml.filter("SQ")

var x_raw = "<?xml version='1.0'?><Q id ='23'><SQ id='201'><GP id='0'></GP></SQ></Q>";
var xml = $.parseXML(x_raw);
var xmlDoc = $(xml);
var collection = xmlDoc.filter("SQ");

var serializer = new XMLSerializer();
var xmlString = serializer.serializeToString(xml));