---
title: "HPRL: A Language for Building Expert Systems"
authors:
  - "Steven Rosenberg"
doi: ""
url: "https://ijcai.org/proceedings/1983/51"
pdf: "https://ijcai.org/proceedings/1983/0051.pdf"
venue: "Proceedings of the Eighth International Joint Conference on Artificial Intelligence"
year: 1983
pages: "215-216"
track: "Expert Systems"
keywords:
---

# HPRL: A Language for Building Expert Systems

Steven Rosenberg

*Proceedings of the Eighth International Joint Conference on Artificial Intelligence*, pages 215-216.

## Abstract

This paper describes an extension of FRL (Frame Representation Language) which supports the encoding of reasoning knowledge within a frame-based formalism . The extension is called HPRL (Heuristic Programming and Representation Language) . The declarative representation of reasoning knowledge in the same formalism that is used to represent domain knowledge results in a powerful tool for the construction of expert systems . Reasoning knowledge is easy to describe, examine and modify . Rules can be reflexive, allowing the construction of powerful meta-rules. HPRL runs on a Vax 11/780 , and on the HP-9836. It has been used for various exploratory projects at Hewlett-Packard, including a program to diagnose faults during IC manufacturing, a program for analyzing dual-channel ECG information to diagnose arrhythmias, and a program for analyzing spectra from infrared and mass spectrometers.