jsonToDOM.namespaces = {
	html: "http://www.w3.org/1999/xhtml",
	xul: "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
};

jsonToDOM.defaultNamespace = jsonToDOM.namespaces.html;

function jsonToDOM(jsonTemplate, doc, nodes) {
	function namespace(name) {
		var reElemNameParts = /^(?:(.*):)?(.*)$/.exec(name);
		return { namespace: jsonToDOM.namespaces[reElemNameParts[1]], shortName: reElemNameParts[2] };
	}

	// Note that 'elemNameOrArray' is: either the full element name (eg. [html:]div) or an array of elements in JSON notation
	function tag(elemNameOrArray, elemAttr) {
		// Array of elements?  Parse each one...
		if (Array.isArray(elemNameOrArray)) {
			var frag = doc.createDocumentFragment();
			Array.prototype.forEach.call(arguments, function(thisElem) {
				frag.appendChild(tag.apply(null, thisElem));
			});
			return frag;
		}

		// Single element? Parse element namespace prefix (if none exists, default to defaultNamespace), and create element
		var elemNs = namespace(elemNameOrArray);
		var elem = doc.createElementNS(elemNs.namespace || jsonToDOM.defaultNamespace, elemNs.shortName);

		// Set element's attributes and/or callback functions (eg. onclick)
		for (var key in elemAttr) {
			var val = elemAttr[key];
			if (nodes && key == "key") {
				nodes[val] = elem;
				continue;
			}

			var attrNs = namespace(key);
			if (typeof val == "function") {
				// Special case for function attributes; don't just add them as 'on...' attributes, but as events, using addEventListener
				elem.addEventListener(key.replace(/^on/, ""), val, false);
			}
			else {
				// Note that the default namespace for XML attributes is, and should be, blank (ie. they're not in any namespace)
				elem.setAttributeNS(attrNs.namespace || "", attrNs.shortName, val);
			}
		}

		// Create and append this element's children
		var childElems = Array.prototype.slice.call(arguments, 2);
		childElems.forEach(function(childElem) {
			if (childElem != null) {
				elem.appendChild(
					childElem instanceof doc.defaultView.Node ? childElem :
						Array.isArray(childElem) ? tag.apply(null, childElem) :
						doc.createTextNode(childElem));
			}
		});

		return elem;
	}

	return tag.apply(null, jsonTemplate);
}