在生产管理中需要的最重要的模式特性是定义自定义数据结构的能力。

The most important schema feature that you need in your production management is the ability to define customized data structures.

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请注意，清单3中定义的sessiondata类是用于保存各种购物车信息的用户自定义数据结构(点击本文顶部或底部的code图标)。

Note that the SessionData class defined in Listing 3 is a user-defined data structure to store various shopping cart information (Click the code icon at the top or bottom of this article).

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为了让您能更好地理解 refresh() 方法，我先来简单介绍一下我所使用的自定义的数据结构。

You'll understand the refresh() method better with a brief explanation of the self-defined data structures that I am using.

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