In the present case, the items being searched are documents that are described both by metadata and content, but the basic user interface is the same as in the e-commerce case.

目前情况下，要搜索的项是通过元数据和内容共同描述的文档，但是基本用户界面与电子商务应用程序相同。

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For example, for the typical e-commerce site there are four (at least) basic use cases.

例如，对于典型的电子商务站点，有四个(至少)基本用例。

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This paper introduces the basic concepts of SET, the primary technologies involved and the running procedure, at the same time it analyses how SET implement the security of e - commerce.

这里详细介绍了SET的基本概念、所使用的主要技术以及运行的过程，同时分析了SET是怎样解决网上交易安全性的。

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