private static String checkJDOMName(final String name) {
    // Check basic XML name rules first
    // Cannot be empty or null
    if (name == null) {
      return "XML names cannot be null";
    }

    //final int len = name.length();
    if (name.isEmpty()) {
      return "XML names cannot be empty";
    }

    // Cannot start with a number
    if ((byte)0 == (CHARFLAGS[name.charAt(0)] & MASKXMLSTARTCHAR)) {
      return "XML name '" + name + "' cannot begin with the character \"" +
             name.charAt(0) + "\"";
    }
    // Ensure legal content for non-first chars
    // also check char 0 to catch colon char ':'
    for (int i = name.length() - 1; i >= 1; i--) {
      if ((byte)0 == (byte)(CHARFLAGS[name.charAt(i)] & MASKXMLNAMECHAR)) {
        return "XML name '" + name + "' cannot contain the character \""
               + name.charAt(i) + "\"";
      }
    }

    // If we got here, everything is OK
    return null;
  }
private static String checkJDOMName(final String name)