EMA C++ Performace Tools Guide : 8 Input File Details : 8.1 Message Content File and Format : 8.1.1 Encoding Fields
 
8.1.1 Encoding Fields
Performance tools can encode in their fields any of the primitive types supported by the Enterprise Message API.
Each field must have the correct type for its ID according to the dictionary loaded by the tool. Fields are validated by the message data parser.