If you like, you can add Ruby code to perform extra validation within an application model, enforce data relationships, or trigger other actions.

如果您愿意，您可以添加ruby代码来在应用程序模型中执行额外的验证，加强数据关联，或者触发其他操作。

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This model has defined 4 extra persistent DOM node types, designed a storing method of mixed structure XML documents and created clustered data based on XML document orders.

此模型扩展定义了4种持久化dom节点类型，设计了一种存储混合型XML文档的方法，并依据文档的次序建立了数据聚集。

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