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.
const illegalCharacters = '<em>The Amazing Adventures of Kavalier & Clay</em>';
const cdata = XmlService.createCdata(illegalCharacters);
const text = XmlService.createText(illegalCharacters);
const root =
    XmlService.createElement('root').addContent(cdata).addContent(text);
const document = XmlService.createDocument(root);
const xml = XmlService.getPrettyFormat().format(document);
Logger.log(xml);