清单 15 中惟一 麻烦的条件就是第一条，它要验证消息是一个定义查询而不是其他可能的组合，如 is...
The only vexing conditional in Listing 15 happens to be the first one, which attempts to verify if the message is truly a definition query and not one of the other possible combinations such as is...
我们甚至可以添加条件，其中定义了不能接受的风险级别，并且规定只检索处于过高风险中的支行清单。
We can even add the condition that defines the unacceptable risk level and retrieve only the list of branches that are at risk.
该 XML 文件定义了目录路径和根据条件要执行的操作，而这些条件则包括所有者和文件存在时间（请参见 清单 2）。
The XML defines directory paths and actions to perform based on criteria, such as owner and file age (see Listing 2).
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