每个条目块有一个简单的标题和一组摘要信息，如果 RSS 提要支持的话，还可以包含一个更详细的信息（有时候是全文）。

Each item block has a simple title, a summary set of information and, if the RSS feed supports it, a more detailed (and sometimes complete) version of the story.

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摘要：电子商务使用了刊登广告并出售货物的新方法来进行交易，并为动态开放式电子商务环境中的大组客户提供服务和信息。

Abstract: electronic commerce provides business with new ways of advertising and selling goods, services, and information to large groups of customers in dynamic open electronic commerce environments.

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如果字体、文件、样式、屏幕颜色、修订信息，以及摘要信息组包含着文档格式化属性，那么它们必须在第一块纯文本之前被定义。

If the font, file, style, screen-color, revision mark, and summary-information groups and document-formatting properties are included, they must precede the first plain-text character in the document.

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