XPath functions can be evaluated in any order and any number of times.
xpath函数可以按照任意的顺序求值任意多次。
When you have created a context you can enter and exit it any number of times.
当你创建了一个context后,你可以进入和退出任意次。
You can specify this parameter any number of times to represent all of the changes that need to be made.
可以多次指定该参数来表示需要完成的修改。
Of course, you can take a function and take derivatives any number of times.
当然,你可以随意拿一个函数,对它求任意阶的导数
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