提出实体参数化逆向造型设计的方法，介绍应用该方法开发圆锥齿轮三维实体参数化造型设计系统的过程。
Process of parametric modeling of bevel gear with standard evolute tooth on PC based CAD system is presented.
参数实体用于将外部声明拖到 DTD 中，或者用于创建 DTD 内部宏来改善可读性。
Use parameter entities to pull external declarations into your DTD, or to create in-DTD macros to improve readability.
参数实体只用于DTD和文档的内部子集中。
Parameter entities are only available inside the DTD and the internal subset of your document.
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