映射消息实例通过会话对象创建。

A map message instance is created using the session object.

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JMS提供者必须支持嵌入的映射消息来对集合类进行转换。

The JMS provider must support nested map messages to convert collection classes.

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映射消息实际上是一组键值对，这使它适合携带扁平结构的文档，如前文所述。

The map message is essentially a set of key-value pairs, which makes it suitable to carry a flattened document, as described in the previous section.

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