* Uses both the modelVersion element and namespace URI for detection.
     *
     * @param pomDocument the POM document (domtrip Document)
     * @return the detected model version
     */
    public static String detectModelVersion(Document pomDocument) {
        Editor editor = new Editor(pomDocument);
        Element root = editor.root();
        if (root == null) {
            return MODEL_VERSION_4_0_0;
        }