The element <attachmentRef> contains the file name of the attachment.The full file name consists of the prefix "COM", the comment code (ie, the attributes of the element <commentCode>) and the attachment number, all items separated by dashes. The file name ends with a separation character (usually ".") and the file type extension (eg, PDF, ZIP, XLS).COM-YY-YYYYY-XXXX-NNNNN-A-MM.EXTorCOM-YYYYYYYYYYYYYY-YYYYY-XXXX-NNNNN-A-MM.EXTWhere:− "MM" is the attachment number starting with "01"− "EXT" is the file type extensionNoteThe allowed file types must be defined by the project or the organization and must be supported by the viewing systems.