和主题选择一样，消息选择标准表达式使用sql样式的语法定义，该语法必须求解出一个布尔值。
Like topic selection, message selection criteria expressions are defined using a SQL-like syntax, which must resolve to a Boolean value.
尼森堡姆教授和巴斯先生一起共事，把关于语境完整性的变量的冗长的描述转化为一种可以组织成为计算机程序的标准表达式。
Dr Nissenbaum has been working with Mr Barth to turn these wordy descriptions of the variables of contextual integrity into formal expressions that can be incorporated into computer programs.
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