The Mapping node provides a graphical way of performing mappings between fields in an input message or database, to one or more output messages or database tables.
映射节点为输入消息或数据库中的字段之间、以及到一个或多个输出消息或数据库表执行映射提供了图形方法。
It maintains the state of the workflow till the workflow completes. It is also responsible for mapping an incoming message to a workflow instance.
它将维护工作流程的状态直到执行完毕，也负责将接收到的信息映射到工作流程的实例中去。
Also, sometimes a service implementer might want to develop his or her own way of mapping an incoming SOAP message.
另外，服务实现者有时候也可能希望开发自己的方式映射传入的SOAP消息。
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