Table 3 also shows that a user-defined error message is also returned.

表3还显示用户定义的错误消息也被返回。

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Section 3 takes the extracted schema file and writes it to the broker's local file system using a user-defined file output node.

第3部分获取提取的模式文件，并使用用户定义的File输出节点将其写入到代理的本地文件系统。

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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).

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)。

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