当那些希望所接收的数据符合特定格式或满足业务内容验证规则的应用程序或组件接收数据时，这些验证可以防止错误发生。

These validations prevent errors when the data is received by applications or components that expect the data to be in a particular structure and comply with business content validation rules.

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粗粒度组件与SOA中的服务具有更为直接的对应关系，与业务模型中可识别的内容的对应性更好。

Coarse-grained components match more directly to the services in an SOA and map more readily to things that would be recognizable from a business model.

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portlet需要知道有关业务组件的两点内容。

The portlet needs to know two things about the business component.

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