===== 8.4 APDU Command Formats ===== [[8.3_Data Formats| Section 8.3, Data Formats]] described the various elements included in the data portion of the Java Card RMI messages. This section describes the complete format of the APDU commands: the header as well as the data portion containing the message elements described earlier. Note - Java Card RMI message protocol supports only the 1 byte encodings of the Lc and Le values of the APDU data length.