Abstract: everal improvements of EXP-ODL language comparing with EXPRESS language are introduced;the system architectures of EXP2CPP are given, which is the processer of EXP-ODL language of EDM S and represents the functions of modules and processing mechanism of EXP2CPP.Several basic mapping rules from EXP-ODL schema definitions to C++class sehema are represented.

Key words: engineering, data base management systems, data management, computer aided de-sign, computer aided manufacturing