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<p>The first phase of the ESPRIT project CAD*I resulted in a specification for the exchange of solid models as well as in some pilot implementations of processors based on this specification. The authors summarize the CAD*I approach, addressing the structure of neutral files for solids, entities, and attributes supporting three kinds of representations: facilities for the transfer of parametric designs; referencing library components; and other general mechanisms. They also describe the current state of the specification and processor implementations and include an example of a CAD*I neutral file. Results from cycle and intersystem solid model transfer tests are presented, showing the practicality of the CAD*I proposal. B-rep model transfer results are discussed in some detail. The relationship of this work to standardization efforts is outlined.</p>

U. I. Kroszynski, B. Palstroem, E. Trostmann and E. G. Schlechtendahl, "Geometric Data Transfer Between CAD Systems: Solid Models," in IEEE Computer Graphics and Applications, vol. 9, no. , pp. 57-71, 1989.
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