public static boolean isValidXmlIdentifier(String s) {
        if (s != null) {
            int len = s.length();
            if (len == 0) {
                return false;
            }
            for (int i = 0; i < len; i++) {
                char ch = s.charAt(i);
                if ( (i == 0 && !Character.isUnicodeIdentifierStart(ch)) ||
                     (!Character.isUnicodeIdentifierStart(ch) && !Character.isDigit(ch) && !Utils.isIdentifierHelperChar(ch)) ) {
                    return false;
                }
            }
            return true;
        }

        return false;
    }