我们接下来的一个任务是在xml树中找出一个特定区域，我们可从中抽取我们的数据而无需关心外来信息。
Our next task then is to locate a specific region in the XML tree from which we can extract our data without concerning ourselves with the extraneous information.
您可以获得原始数据包信息，并找出正使用正确的设置进行传输的信息(例如，哪些用户正从哪些主机上登录到某台特定的邮件服务器)。
You can get the raw packet information and find out what information is being transferred with the right Settings (for example, which users are logging in to a particular mail server from which host).
该信息通常存储在一个关系数据库中并且可用于特定的用途，例如，用于找出目标市场活动的一组潜在客户。
The information is often stored in a relational database and, for example, can be used to isolate a list of potential customers for a targeted marking campaign.
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