I do not know of a predefined function in XSLT to accomplish this.
我不知道在XSLT来完成这一个预定义的函数。
Each channel has a predefined function and is either a read channel or a write channel.
每个通道都是一个预定义的函数，它可能是一个读通道，也可能是一个写通道。
Documents are ranked as a predefined function of the logical forms from the documents and the query.
按照文件和查询的逻辑形式的预定函数将文件排序。
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