But, you can only accomplish two other popular operations on a set of Numbers, finding the minimum and maximum, by a recursive template or extension function.
但是只能通过递归模板或者扩展函数来完成其他两种常见的操作：求最大值和最小值。
Most providers of an XSLT processor added an extension function, usually called node-set , which allows the RTF to become a navigable and filterable tree.
多数XSLT处理程序的提供商都增加了一个扩展函数，通常称为node - set，它可以把RTF变成可导航、可筛选的树。
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