Chameleon generates a custom message class for each message defined in the message definition file. This message class will have methods for accessing the tables and table group objects contained in the message.

In terms of the class hierarchy, each message inherits from the CHMmessage class, which inherits from the CHMtable object. The naming convention for the message classes is <prefix>Msg<Message Name>. For example, if a message was called PatientAdmit and you chose a generation prefix of 'HL7', the C++ class would be HL7MsgPatientAdmit.