当消息不透明的、不解析或者只需要路由时，可以使用 BLOB 域。
The BLOB domain can be used when the message is treated as opaque, not parsed, and simply routed.
消息是一个不透明的数据包，这些包有如下性质。
A message is an opaque piece of data with properties. Among these properties are.
过程执行、接收消息、处理消息并将新消息发送出去。但是过去你的过程定义、执行是相当不透明的。
Processes get executed, receive messages, manipulate them and send new ones but past your process definition, the execution is fairly opaque.
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