XmlElement (creates xml in javascript)

test.js

var xml = new XmlElement("teste", function(el, at, text){
    el("sub1", "test");

    el("sub2", function(el, at, text){
        at("name", "John Doe");
        text("123");
    });

    el("sub3", function(el, at, text){
        el("sub4", function(el, at, text){
            at("val", "something");
            at("val2", "something else");
            text('test');
        });
    });
});

console.log(xml.toString());

XmlElement.js

/**
 * Represents a XML element
 *
 * @param {string} elementName
 * @param {string|function} contentBuilder
 * @constructor
 */
var XmlElement  = function(elementName, contentBuilder) {

    var name = elementName;
    var text = '';
    var attributes = [];
    var elements = [];
    var _self = this;

    /**
     *
     * @param {string} name
     * @param {string} value
     */
    this.addAttribute = function (name, value) {
        attributes.push({name: name, value: value});
    };

    /**
     *
     * @param name
     * @param {string|function} contentBuilder
     */
    this.createElement = function (name, contentBuilder) {
        var el = new XmlElement(name, contentBuilder);
        elements.push(el);
    };

    /**
     *
     * @param {string} txt
     */
    this.setText = function(txt) {
        text = "<![CDATA[" + txt + "]]>";
    };

    /**
     *
     * @returns {string}
     */
    this.toString = function() {
        var attrsString = "";
        attributes.forEach(function(attr) {
            attrsString += " " + attr.name + "=\"" + attr.value + "\"";
        });

        var str = "<" + name;
        str += attrsString;

        if (text.length == 0 && elements.length == 0) {
            str += " />"
        } else {
            str += ">";

            var subElementsStr = "";
            elements.forEach(function(el){
                str += el.toString();
            });

            str += text;
            str += "</" + name + ">";
        }

        return str;
    }

    //Construct
    if (!name) {
        throw "'name' parameter is required";
    }

    contentBuilder = contentBuilder || '';

    if ((typeof contentBuilder) === "function") {
        contentBuilder(_self.createElement, _self.addAttribute, _self.setText);
    } else {
        _self.setText(contentBuilder);
    }

};