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1 Object Oriented Design Using SDL

This methodology chapter will take you into the world of object oriented SDL, as introduced in the 1992 version of the language. It will follow one case (a simple Access Control system) from the specification to the final SDL design. A simple OO analysis (according to the SOMT method) is performed, followed by an object oriented design using SDL.

The object oriented SDL concepts are introduced step by step by developing different versions of the Access Control system. The first version will make use of the OO concepts block types and process types only. The final version will use more advanced OO concepts, such as inheritance (specialization), virtual types and type libraries (package diagrams).

Note that this chapter does not deal with all parts of the SOMT method described in the SOMT Methodology Guidelines starting in chapter 69 in the User's Manual; it mainly focuses on the usage of object oriented SDL in the design activities of SOMT.


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