To create a filesystem with fuse, you need to declare a structure variable of type fuse_operations and pass it on to the fuse_main function.
要使用fuse来创建一个文件系统，您需要声明一个fuse_operations类型的结构变量，并将其传递给fuse_main函数。
If the var attribute is specified, then a scoped variable with the indicated name will be created and assigned the current value of the index for each pass through the iteration.
如果指定了var属性，那么将会创建一个带有指定名称的并限定了作用域的变量，并将每次迭代的当前索引值赋给该变量。
In Viper 2, this limitation has been removed and now you are able to pass a runtime variable to a relational query embedded inside the XQuery.
在Viper 2中，这个限制已经消除了，现在可以向XQuery中嵌入的关系查询传递运行时变量。
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