rss

作者: Robin 分类: 百科知识 发布时间: 2008-09-07 14:08

(也叫聚合内容,Really Simple Syndication)是一种描述和同步网站内容的格式,是目前使用最fbhbn t应用。可以被称为资源共享模式的延伸。

RSS最早要追溯到1995年,当Ramanathan V. Guha和其他在苹果电脑公司的高级技术组开发了一个测试的内容框架
RDF 网页概述是最早版本的RSS, 他最早与199年3月在网景公司由Guha创建使用.用于Netscape.Com网景的端口
1999年7月 网景公司的Dan Libby 开发了一个新的版本,于是就产生了 RSS 0.91
  
RSS是一种起源于网景的技术,将用户订阅的内容传送给他们的通讯协同格式(Protocol)。RSS可以是以下三个解释的其中一个:

Really Simple Syndication

RDF (Resource Description Framework) Site Summary

Rich Site Summary

但其实这三个解释都是指同一种Syndication的技术。 RSS目前广泛用于网上新闻频道,blogwiki,主要的版本有0.91, 1.0, 2.0。
RSS:(recombination signal sequence)重组信号序列
RSS由一个共同的回文七核苷酸序列(CACAGTG)和一个共同的富含A的九核苷酸序列(ACAAAAAACC)组成,中间为固定长度的间隔序列。
  
RSS 1.0
以下是RSS 1.0的代码样例
<?xml version=”1.0″?>
  
<rdf:RDF
  xmlns:rdf=”http://www.w3.org/1999/02/22-rdf-syntax-ns#”
  xmlns=”http://purl.org/rss/1.0/”>
  
  <channel rdf:about=”http://www.xml.com/xml/news.rss”>
    <title>XML.com</title>
    <link>http://xml.com/pub</link>
    <description>
      XML.com features a rich mix of information and services
      for the XML community.
    </description>
    <image rdf:resource=”http://xml.com/universal/images/xml_tiny.gif” />
  
    <items>
      <rdf:Seq>
        <rdf:li rdf:resource=”http://xml.com/pub/2000/08/09/xslt/xslt.html” />
        <rdf:li rdf:resource=”http://xml.com/pub/2000/08/09/rdfdb/index.html” />
      </rdf:Seq>
    </items>
    <textinput rdf:resource=”http://search.xml.com” />
  </channel>
  
  <image rdf:about=”http://xml.com/universal/images/xml_tiny.gif”>
    <title>XML.com</title>
    <link>http://www.xml.com</link>
    <url>http://xml.com/universal/images/xml_tiny.gif</url>
  </image>
  
  <item rdf:about=”http://xml.com/pub/2000/08/09/xslt/xslt.html”>
    <title>Processing Inclusions with XSLT</title>
    <link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>
    <description>
     Processing document inclusions with general XML tools can be
     problematic. This article proposes a way of preserving inclusion
     information through SAX-based processing.
    </description>
  </item>
  
  <item rdf:about=”http://xml.com/pub/2000/08/09/rdfdb/index.html”>
    <title>Putting RDF to Work</title>
    <link>http://xml.com/pub/2000/08/09/rdfdb/index.html</link>
    <description>
     Tool and API support for the Resource Description Framework
     is slowly coming of age. Edd Dumbill takes a look at RDFDB,
     one of the most exciting new RDF toolkits.
    </description>
  </item>
  
  <textinput rdf:about=”http://search.xml.com”>
    <title>Search XML.com</title>
    <description>Search XML.com’s XML collection</description>
    <name>s</name>
    <link>http://search.xml.com</link>
  </textinput>
</rdf:RDF>
RSS 2.0
以下是RSS 2.0的代码样例
<?xml version=”1.0″?>
<rss version=”2.0″>
   <channel>
     <title>Lift Off News</title>
     <link>http://liftoff.msfc.nasa.gov/</link>
     <description>Liftoff to Space Exploration.</description>
     <language>en-us</language>
     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>
     <ttl>5</ttl>
  
     <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 Star City.</description>
       Tue, 03 Jun 2003 09:39:21 GMT</pubDate>
       <guid>http://liftoff.msfc.nasa.gov/2003/06/03.html#item573</guid>
     </item>
  
     <item>
       <title>Space Exploration</title>
       <link>http://liftoff.msfc.nasa.gov/</link>
       <description>Sky watchers in Europe, Asia, and parts of Alaska and Canada
         will experience a partial eclipse of the Sun on Saturday, May 31st.</description>
       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>
       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>
       Tue, 20 May 2003 08:56:02 GMT</pubDate>
       <guid>http://liftoff.msfc.nasa.gov/2003/05/20.html#item570</guid>
     </item>
   </channel>
</rss>

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