In the paper the basic elements of CAD systems from software point of view are dis-cussed.The creation and next the modification of CAD systems needs specialized software tools.In thepaper the idea computer Aided Software Engineering(CASE)for CAD systems production and practi-cal software realization of such a software tool is considered.The main element of this tool is specialprogram provided for convenient storage and modification of CAD source program.In the paper thesimple examples are presented and discussed.
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