A Command and Query Language Assembler for an Extended Data Management System

摘要

For a data management system with information storage and retrieval capabilities a language is needed by which a user of the system can specify the records he wishes to retrieve and the operations he wishes to perform on these records. The Command and Query Language under discussion was developed to meet these needs for the extended data management system. Its development was divided into two spheres of responsibility. The first sphere, referred to as the Assembler, centers on the routines needed for accepting and translating user requests. The second sphere centers on those routines needed for executing the translated requests. These routines are called collectively the Interpreter. The design of the Command and Query Language and the implementation of the Assembler is the topic of this report. The design of the Language involves the following steps: Define the requirements of the Language, Define the (external) syntax and semantics of the Language, and Design an internal form of the Language to allow efficient processing by the Interpreter.