Creating a view of the XML data helps to abstract the structure of the product XML from the application code, by allowing us to simply query the view.
创建XML数据视图使我们可以轻松地查询视图，从而有助于从应用程序代码理解产品XML的结构。
The choice of the data structure often begins from the choice of an abstract data type.
所选择的数据结构往往首先从选择一个抽象的数据类型。
It is basically a passive data structure holding an abstract description of an action to be performed.
它基本上是一个被动持有一个抽象数据结构的描述一个动作。
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