规范化文档元素之外和起始、结束标签之间的空白。
Whitespace outside of the document element and within start and end tags is normalized.
参照西门子802S数控系统编程规范，对NC程序头、起始部分、程序尾等所涉及的控制语句和变量进行了重新调整和设计；
These correlative control sentences and variables are adjusted and designed renewedly that are for CNC head and start and tail ect, according to programme criterion about 802S.
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