还可以使用string函数来报告字符串属性，如子串的长度或位置，例如

You can also use string functions to report string attributes such as length or position of a sub-string, for example

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在这种情况下，将输入节点与一个名为id的节点相比较，id节点的子文本节点由传递给函数的Name字符串构成。

In this case, you compare the input node against a node named id that has a child text node made of the name string passed in to the function.

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标记的属性和子元素都是单个字符串，因此，可以使用concat函数连接它们。

The attributes and subelements of the tag are each a single string, so you compose them using concat .

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如前所述，contains函数实现子字符串匹配，因此对于以上查询返回true。

As previously mentioned, the contains function implements sub-string matching and therefore returns the value true for the above query.

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函数地作用是：返回子字符串可以。

The substr function returns a part of a string.

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函数的作用是：查找子字符串出现次数。

The substr_count() function counts the number of times a substring occurs in a string.

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函数的作用是：查找子字符串出现次数。

The substr_count() function counts the number of times a substring occurs in a string.

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