A Module for Improving Data Access and Management in an Integrated CAD Environment

A modular system is presented for handling design data, centered around the relational DBMS Ingres, taking advantage of a very careful database schema generation and of the use of software modules to comply with the specific requirements of design data. This work is mainly concerned with one of these modules, called LIPS, which enables the system to handle design data local to an application program with a high level query language, interactive level performances and the ability to support complex design objects. LIPS is composed of two programs: a schema analyzer and a precompiler, and its query language (Loquel) must be embedded in Pascal source code.