第一个方法是使用RFC 4627中所定义的正则表达式确保JSON数据中不包含活动的部分。
The first approach is to use the regular expressions defined in RFC 4627 to make sure the JSON data doesn't contain active parts.
也就是说，Message Broker中的新节点能够接受节点应用的路由决策中使用的表达式，也能够用作消息传输处理活动的一部分。
That is, new nodes in message Broker are capable of accepting expressions used in the routing decisions applied by nodes or used as part of their message transformation processing activities.
选择活动包含case元素，这些case元素由计算结果为True或False并且后跟一系列活动的表达式。
A choice activity contains case elements that consist of an expression that evaluates to either true or false, followed by a sequence of activities.
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