XML聚合格式 ATOM

        Atom 文档示例：
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title type="text">...</title>
<subtitle type="html">...</subtitle>
<updated>...</updated>
<id>...</id>
<link rel="alternate" type="text/html"
   hreflang="en" href="http://example.org/"/>
<copyright>...</copyright>
<generator uri="http://www.example.com/" version="1.0">    ...</generator>
<entry>
    <title>...</title>
    <link rel="alternate" type="text/html"
     href="http://example.org/2005/04/02/atom"/>
    <link rel="enclosure" type="audio/mpeg" length="1337"
     href="http://example.org/audio/ph34r_my_podcast.mp3"/>
    <id>...</id>
    <updated>...</updated>
    <published>...</published>
    <author>
      <name>...</name>
      <uri>...</uri>
      <email>...</email>
    </author>
    <contributor>
      <name>...</name>
      <uri>...</uri>
    </contributor>
    <contributor>
      <name>...</name>
      <uri>...</uri>
    </contributor>
    <content type="xhtml" xml:lang="en"
     xml:base="http://diveintomark.org/">...</content>
</entry>
</feed>