如果这些请求数据在该请求消息的SOAP消息头部分中传送，那么用户就可以调用这个显式消息头。
If some of the request data is transferred in the SOAP header part of the request message, you can call this an explicit header.
有些数据（比如来自事务或其他消息传送系统的信息）可能已经使用了事件格式。
Some data, such as information from transactions, or some other messaging system, may already be in event format.
服务外部的数据作为消息在服务间传送，必须以一种发送方服务和接受方服务都可以理解的方式定义。
Data outside a service is sent between services as messages and must be defined in a way understandable to both the sending service and the receiving service.
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