NC模块与造型模块完全嵌套，所有数据保存成为一个文件产生坐标系等方法在造型和加工里面是一样的。
The NC module is fully integrated with modelling, and all data is stored in a single file. Methods used for creating Workplanes etc. are identical in both modelling and machining.
关系型数据是平面的、高度结构化、强类型化、无序的，而XML数据是有序、嵌套的、层次化的、可选类型化的，并且往往不规则且是不完全结构化的。
Relations are flat, highly structured, strongly typed, and unordered while XML data is ordered, nested, hierarchical, optionally typed and often irregular and semi-structured.
当一个标记完全被另一个标记包围时，就说它是嵌套的。将一个标记置于另一个标记之内无需特殊的设置或编码。
A tag is said to be nested when it is completely surrounded by another tag: no special setup or coding is required to put one tag within another.
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