The prolog section includes the framework file, and a header or footer file (if applicable).
You can add additional include files using the <lang>_CG::Class/Package::SpecIncludes property. You might have to add additional include files if you create dependencies to modules that are not part of the IBM® Rational® Rhapsody® design.
For example:
#ifndef class_H
#define class_H
#include <oxf.h> // The framework header file
//------------------------------------------------------
// class.h
//------------------------------------------------------