locating listing
英 美
Adding XPath expressions to the exception message, as shown in Listing 7, results in a more detailed description of the validation failure, which greatly simplifies locating the problem.
如清单7所示，添加XPath表达式到异常消息将产生更详细的对验证失败的描述，这样大大方便了发现问题。
Listing 4: Locating the right module for a task.
清单4：为任务定位适当的模块。
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