function isXMLList(xml) { // this is needed because XML inherits from XMLList (wtf)
	if (typeof xml !== "xml") {
		return false;
	}
	if (!!xml.length()) { // if 0, xml can only be a XML list
		try {
			xml[0] = xml[0]; // throws error on all non-XML lists (don't do this with an empty XMLList though)
		} catch (ex) {
			return false;
		}
	}
	return true;
};