标题：如何做rss？RSS规范
出处：北京SEO_北京SEO培训 - 【元创SEO】
时间：Sat, 21 Feb 2009 16:15:27 +0000
作者：元创
地址：http://www.yuan-chuang.cc/read.php/184.htm

内容：
如何做rss？RSS规范

     我们使用的是应用得比较广泛的RSS 2.0规范，参考Berkman Center 提供的 RSS 2.0 Specification。做为XML的方言，它首先必须是一个完整的符合XML 1.0 specification 的XML文档。
      是每个xml文档都必须出现的声明。接下来是这样的标记，表示我们使用的是RSS 2.0规范。
     我们提供了RSS 2.0规范中的Sample，做为RSS解析模块的标准测试集。

<?xml version="1.0"?>
<rss version="2.0">
   <channel>
      <title>Liftoff News</title>
      <link>http://liftoff.msfc.nasa.gov/</link>
      <description>Liftoff to Space Exploration.</description>
      <language>en-us</language>
      <pubDate>Tue, 10 Jun 2003 04:00:00 GMT</pubDate>
      <lastBuildDate>Tue, 10 Jun 2003 09:41:01 GMT</lastBuildDate>
      <docs>http://blogs.law.harvard.edu/tech/rss</docs>
      <generator>Weblog Editor 2.0</generator>
      <managingEditor>editor@example.com</managingEditor>
      <webMaster>webmaster@example.com</webMaster>
      <item>
         <title>Star City</title>
         <link>http://liftoff.msfc.nasa.gov/news/2003/news-starcity.asp</link>
         <description>How do Americans get ready to work with Russians aboard the International Space Station? They take a crash course in culture, language and protocol at Russia's <a href="http://howe.iki.rssi.ru/GCTC/gctc_e.htm">Star City</a>.</description>
         <pubDate>Tue, 03 Jun 2003 09:39:21 GMT</pubDate>
         <guid>http://liftoff.msfc.nasa.gov/2003/06/03.html#item573</guid>
      </item>
      <item>
         <description>Sky watchers in Europe, Asia, and parts of Alaska and Canada will experience a <a href="http://science.nasa.gov/headlines/y2003/30may_solareclipse.htm">partial eclipse of the Sun</a> on Saturday, May 31st.</description>
         <pubDate>Fri, 30 May 2003 11:06:42 GMT</pubDate>
         <guid>http://liftoff.msfc.nasa.gov/2003/05/30.html#item572</guid>
      </item>
      <item>
         <title>The Engine That Does More</title>
         <link>http://liftoff.msfc.nasa.gov/news/2003/news-VASIMR.asp</link>
         <description>Before man travels to Mars, NASA hopes to design new engines that will let us fly through the Solar System more quickly.  The proposed VASIMR engine would do that.</description>
         <pubDate>Tue, 27 May 2003 08:37:32 GMT</pubDate>
         <guid>http://liftoff.msfc.nasa.gov/2003/05/27.html#item571</guid>
      </item>
      <item>
         <title>Astronauts' Dirty Laundry</title>
         <link>http://liftoff.msfc.nasa.gov/news/2003/news-laundry.asp</link>
         <description>Compared to earlier spacecraft, the International Space Station has many luxuries, but laundry facilities are not one of them.  Instead, astronauts have other options.</description>
         <pubDate>Tue, 20 May 2003 08:56:02 GMT</pubDate>
         <guid>http://liftoff.msfc.nasa.gov/2003/05/20.html#item570</guid>
      </item>
   </channel>
</rss>

根节点为<channel>标签：其中可选的文本域为<title>表示channel的标题，<description>表示channel的详细描述，这是我们要提取和最后显示的。之后每个独立的<item>节点用来表述不同的单项，里面<title>、<description>、<link>、<pubDate>是我们程序要处理的内容。 




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