1.  host element
2.  major element
3.  principal element

• 1. 主元素: host element | pivotal element
• 2. 施主元素: donor element
• 3. 自主元素: autonomic element

更多释义

• 1.为添加对主类别页面的支持，我创建了一个新的主元素：。
  To add support for main category pages, I create a new master element:.
  dict.yoduao.com
• 2.在这个主元素中有若干个entry元素，这些元素定义了订阅源的内容项。
  Within this main element sit any number of entry elements, which define items of content within the feed. Listing 1 shows a sample Atom feed with a single entry element, derived from my own web site.
  dict.yoduao.com
• 3.Activity Streams entry元素总是包含三个主元素，它们表示。
  An Activity Streams entry element always contains three main elements that indicate.
  dict.yoduao.com

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