A function called equalString, which compares two given strings to see if they are equal, is supported by an extended index based on hashing.

基于hash的一个扩展索引支持一个名为equalstring的函数，该函数比较两个给定的字符串，看看它们是否相等。

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The position() function returns the one-based index of the node within the node set.

position() 函数返回节点集中节点的基于 1 的索引。

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Based on the multiple controllers, a multiple model adaptive controller can be formed by using an index switching function.

给定一个指标切换函数，基于多个自适应模型控制器和给定的指标切换函数构成多模型自适应控制器。

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