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Agora: message passing as a foundation for exploring OO language concepts

Agora is a framework for exploring object-oriented languages. In this paper we will discuss a particular prototype-based instance of Agora that features a general mixin-based approach to (multiple) inheritance. One of the major innovations of Agora is that many important features of object-orientation including inheritance, slot access, reification, cloning and inline objects are introduced by means of message passing rather than by ordinary programming structures.The syntax and semantics of Agora is explained and illustrated with examples. Furthermore, an FTP-site is given where a Smalltalk implementation of Agora can be found.