xmlGenerator.js

function xmlEscape(s) {
    return s.replace(/[<>&"]/g, function (c) {
        return "&"
            + { "<": "lt", ">": "gt", "&": "amp", "\"": "quot" }[c]
            + ";";
    });
}

var xml = [ "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" ];

xml.text = function () {
    Array.prototype.push.apply(this, arguments);
    return this;
};

xml.elem = function (tagName, attrs, selfClose) {
    this.text("<", tagName);

    for (var a in attrs || {}) {
        this.text(" ", a, "=\"", xmlEscape(String(attrs[a])), "\"");
    }

    this.text(selfClose ? "/" : "", ">\n");

    return this;
};

xml.toString = function () { return this.join(""); }

/* Usage */

// Add an element with attributes
xml.elem("root", { attrib1: "hello", attrib2: "world" });

// Add a self-closing element (as child of previous)
xml.elem("child", { attrib: 42 }, true);

// Add some nested children
xml.elem("child").elem("nested", {}, true).elem("/child");

// Note that calls to elem() and text() can be chained

// Add an element with text content
xml.elem("child", {}).text("Hello World!").elem("/child");

// Close the root node
xml.elem("/root");

// Get the generated XML
alert(xml);