The interoperability of distributed and concurrent design is defined by the representation of CAD systems project solutions. Nowadays the exchange of solutions performed by the means of standard ISO 10303 and STEP format, created in the frames of CALS technology. It does not allow to modify solutions. This article describes project solutions extraction capability from design activity, models of design object classes formation, as well as to store, to map and further to use information in the context of the functionally adapted representation. The functionally adapted representation concept allows exchanging solutions by the other method. In this case, the main idea is the fixation of solution creation procedure (consists of operation chain) in the procedure chain. Based on the procedure chain author's instrumental environment generates the lightweight CAD. It is a compact software application for engineering. The required operation set for the design object creation determines the lightweight CAD functionality. In this case, the logic and the modification ability of project process is stored inside of the selected project operation class.
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