一般情况下在使用高级抽象，比如函数编程时，您不需要了解实现细节，但这并不意味这在必要的情况下，就无法了解。
Just because you usually surrender knowledge of implementation details when using higher-level abstractions like functional programming doesn't mean that you can't get down and dirty if you must.
高等数学——XSLT在基本数学方面游刃有余，但它不支持三角学、指数函数、对数或其他更为高级的数学运算符及函数。
Advanced math — XSLT can perform basic arithmetic easily enough, but it doesn't support trigonometry, exponential functions, logarithms, or other more advanced mathematical operators and functions.
在导出的绑定属性中，在 Connection 选项卡的高级设置下，对函数选择器进行了定义，如图 1 所示。
The function selector is defined in the binding properties of the export, under the Advanced settings of the Connection tab, as shown in Figure 1.
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