Class Cdata

// Create and log an XML document that shows how special characters like '<', '>', and '&' are
// stored in a CDATASection node as compared to in a Text node.
var illegalCharacters = '<em>The Amazing Adventures of Kavalier & Clay</em>';
var cdata = XmlService.createCdata(illegalCharacters);
var text = XmlService.createText(illegalCharacters);
var root = XmlService.createElement('root').addContent(cdata).addContent(text);
var document = XmlService.createDocument(root);
var xml = XmlService.getPrettyFormat().format(document);
Logger.log(xml);