EMA C++ Developers Guide : 3 OMM Containers and Messages : 3.2 Classes : 3.2.2 DataCode Class
 
3.2.2 DataCode Class
The DataCode class provides two enumeration values that indicate the data’s state:
The DataCode::NoCodeEnum indicates that the received data is valid and application may use it.
The DataCode::BlankEnum indicates that the data is not present and application needs to blank the respective data fields.