Implementation of GDL

This chapter defines and describes an implementation design for GDL. The GDL concept of defining logical access paths as an intrinsic part of data definition yields a system with a high degree of integration between the DDL processor/DML precompiler and the run-time system. The data definition tables established by the DDL processor are used by the DML precompiler not only to generate appropriate code for data manipulation but also to effect local optimization of expressions within DML statements.