Accession Number : ADA293596

Title :   PORK Object System Programmer's Guide.

Descriptive Note : Research rept.,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA ROBOTICS INST

Personal Author(s) : Lassila, Ora

PDF Url : ADA293596

Report Date : APR 1995

Pagination or Media Count : 68

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.

Descriptors :   *PROGRAMMING MANUALS, *KNOWLEDGE BASED SYSTEMS, MODELS, INTERFACES, COMPUTER PROGRAMMING, PROGRAMMING LANGUAGES, SLOTS, ACCESS, INVERSION, FRAMES, VALUE, LINKAGES, DEBUGGING(COMPUTERS).

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE