在一个真实的实现中，每个事件都将包含某种类型的病人标识符，用于从一个外部数据源查找医生的电子邮件地址。

In a real implementation, each event would include some type of patient identifier that would be used to find the doctor's E-mail address from an external data source.

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一个数组他的元素标识出了指定的源可用的媒体的类型。

An array whose elements identify the available media types for the specified source type.

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