The "ASC Data Identifier Maintenance Committee" is the international body for the maintenance of ISO / IEC 15418 Data Identifiers (DIs). Industry, health care and logistics user groups can submit requests to the DIMC for inclusion of new data identifiers, which will be reviewed, evaluated and, if deemed useful, returned for further discussion in view of general application for uniqueness of data elements for bar code and RFID data carrier. The international committee consists of members from Asia, Europe and the USA. In 2014, Bill Hoffman took over the chairmanship 2014 as successor to Craig Harmon and executed 3 years. Due to his retirement, the committee elected the longtime member Mark Lewis as chairman. Mark Lewis, who is a senior manager at UPS, is primarily experienced in global logistics in an international environment. One of the currently accepted data identifiers was the DI "6R" flagging a "Digital Signature" according to ISO / IEC 20248 in 2D barcode and / or RFID.