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我知道这是针对一种情况：
/bookstore/book[@price>20]
并且您可以使用第二组 [] 来指定位置：
/bookstore/book[@price>20][1]
但是如何在节点属性上指定多个条件？
以同样的方式，像
/bookstore/book[@price>20][1][@title!='']
您还可以使用and和or运算符
and
or
/bookstore/book[@price>20 and position() = 1 and @title!='']