Parametric Feature Xml-based Semantic Description Of The Research And Realization

As the development of computer, The Computer-Aided Design technology is being used in the world widely, and the network application is one of the main development directions. Currently, the main CAD softwares are parametric and feature-based, and the three-dimensional modeling technology is the pivotal technology. This paper studies the project "the XML-based information description of 3D CAD features data" and gives the resolution. To implement the interchange of the three-dimensional CAD data, it is necessary to summarize the three-dimensional models and modeling technologies, to grasp the consistency of mathematic and geometry. On such basis, we can establish the rules of expressing, organizing and manipulating the related information, and then establish a set of standards to resolve the problem of interchange between different CAD platforms. The two-dimensional sketch consists of basic geometry items;the different expressions of the same geometry item must be interchangeable on the basis of mathematics and geometry, which is the theoretic basis of the interchange of the two-dimensional sketches between different CAD softwares. To implement this goal on the Web, we must select an interchanging mode that is fit for the network application, and the author adopts XML to implement it. Furthermore, this paper has done some special work on the management of versions and identifying entities. In the paper, the author establishes logic model, explains the related theory and gives an example that proves the theory is viable and right.