This paper presents the architecture and some tools of the software development workbench WSDW. The authors propose a structure-oriented workbench, in which interactive software tools are integrated through sharing a unique high level program representation, satisfying the request of independence from the source language. The data structure representing programs, the web structure, is based upon the mathematical concept of relation and it is easily implemented as a Prolog data base. Program transformations, given as web transformations, can be expressed as rewriting rules, so that software tools can be implemented as sets of rewriting rules and then added to the WSDW.
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