Abstract
The Hierarchical Language System HLS is presented. HLS consists of the structured programming language SPL and the extensible programming language EPL which is built upon SPL layer and provides statement and expression extention facilities, and provides to automate top down programming as much as possible by the following means.(1) To describe each breakdown process in the programming languages EPL and SPL, in order to eliminate ambiguity of each breakdown representations which are in general written in natural languages.(2) To generate the whole system which runs in the actual programming environment by this system.This paper describes HLS concepts and language specifications of its components.HLS effectiveness is to be presented in the near future.
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