Generating data access programs from PCTE schemas with constraints

Presents how we developed a tool for generating data access programs from PCTE data schemas. We propose first an extended PCTE data model which allows constraints to be explicitly described between values of the data types. Our program generator analyzes this data model, which we call the constrained SDS (schema definition set), and generates a C++ library. A class of C++ is generated from each object type defined in the constrained SDS, and a set of member functions is generated from attribute types, link types and constraints defined in the SDS. The library provides convenient ways for accessing data which are stored according to the given constrained SDS. An example shows the benefits of using the program generator for tool development in PCTE