PORK Object System Programmer's Guide.

Abstract

PORK is an object system which brings a conventional object-oriented language closer to the requirements of frame-based programming. It only provides a very limited set of features (on top of the base object system itself), and aims to achieve seamless integration with conventional programming. PORK is implemented as a portable metalevel extension of the Common Lisp Object System (CLOS). It extends CLOS by adding the following concepts: Named objects. These simplify debugging and linked frame model construction. Collections of named objects (called 'namespaces') can also be used as a low-level implementation vehicle for knowledge bases. References to nonexisting named objects. Programs can manipulate objects that have not yet been created. This greatly simplifies definition of complex linked frame models with circular references. Slots with multiple values, and a mechanism for defining an access interface. Automatic updating of inverse slots.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1995
Accession Number
ADA293596

Entities

People

  • Ora Lassila

Organizations

  • Carnegie Mellon University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Automatic
  • Computer Programming
  • Computer Programs
  • Databases
  • Engineering
  • Hash Tables
  • Language
  • Lisp Programming Language
  • Metaprogramming
  • Models
  • Object Oriented Programming
  • Object-Oriented Database Management Systems
  • Programming Languages
  • Self Operation
  • Semantic Models
  • Standards
  • Trees (Data Structures)

Fields of Study

  • Computer science

Readers

  • Artificial Intelligence
  • Database Systems and Applications