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A Pattern-Based Approach for a Flexible, Self-Extending Document System

In this paper we describe our experience with the design of a flexible, self-extending document editing framework using a strictly object-oriented pattern approach. With design patterns we can create a well-structured core system which is both easier to understand and more extendible than traditional designs. Novel combinations of previously known patterns plus a decomposition of the notion of an extension give a software architecture which is easily extendible not only at design-time but also at run-time.