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This paper presents a proposal for a neutral file for CAD data: curves, surfaces, and solids. On the data structuring level, the method for defining semantics is borrowed from the concepts of abstract data types: the effect of elementary operations on the data structure (creation, deletion, identification, navigation) is used. On the reference model level, semantics are defined textually, supported by graphical representations and by mathematical formula. For the interpretation of the neutral file, semantics are defined on the basis of a finite state machine model of a post-processor and described in terms of the effect which the interpretation of the file will produce. The syntax of the HDSL (high level data specification language) is given in BNF notation, the tokens on the neutral file are defined as a regular set of integers coded in one byte each and the structure of the neutral file language (syntax) is defined in Backus-Naur form. A general specification of the architecture of pre- and post-processors is also given.

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Authors: BEY I, Kernforschungszentrum Karlsruhe (DE);SCHLECHTENDAHL E G, Kernforschungszentrum Karlsruhe (DE);LEURIDAN J (EDITORS), Leuven Measurement and Systems, Heverlee (BE)
Bibliographic Reference: EUR 11406 EN (1990) 255 pp.
Availability: Springer-Verlag GmbH & Co. KG, Postfach 10 52 80, Tiergartenstrasse 17, D-6900 Heidelberg 1 (DE)
ISBN: ISBN 3-540-18397-3
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