The Smalltalk-76 programming system design and implementation
POPL '78 Proceedings of the 5th ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Extending object oriented programming in Smalltalk
LFP '80 Proceedings of the 1980 ACM conference on LISP and functional programming
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Smalltalk is an object-oriented language (Ingalls78, KayGoldberg77, Hewitt73). PIE is a subsystem that extends Smalltalk's descriptive power by supporting the creation, storage, retrieval and manipulation of network structures (GoldsteinBobrow80a,b,c; BobrowGoldstein80). These networks have been employed to represent software, documentation, electronic mail, calendars, people, addresses, bibliographic references and other items that together comprise the personal information space of a user of an office information system. By employing a common network representation, PIE supports an integrated environment for software development and office-related tasks. PIE has been developed collaboratively with Dan Bobrow, and is presently being used on an experimental basis by a small community at Xerox PARC. Smalltalk represents entities in the external world as objects. An object has a state—i.e. an assignment of values to a set of state variables—and a class. The class of an object defines the behavior of the object in terms of a set of methods. Thus the class is a generic description of a collection of objects, while the objects associated with a class provide a particular description of the state of individual instances.