A module should specify which Required Data is necessary within the event for its
operation. The mechanism for doing this for C++ modules is not yet installed
however older Fortran modules which are being converted for use in the C++ framework
must communicate this information to the data interface jackets and this
mechanism has been setup. For these purposes the unit of data is a
Trybos
/ybos bank. This will be decribed in greater detail in a future version.