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还是在上周末的时候,看到了Microsoft RSS TeamSLE(Simple List Extensions)扩展。三个单词中,最重要的是List,SLE主要是用来解决Feed订阅阅读模式的某种特定需求而产生的:



  • Treat Feed as List

  • Define customized sorting functions

  • Define customized filting functions


从订阅者的角度来说,订阅了这种Feed,本地的Feed列表将完全和Feed服务器提供的保持同步。这种同步包括几个方面:



  1. Feed Item的次序与服务器上完全相同,如果有更新,则Feed Reader也会更新顺序

  2. Feed Reader不会缓存过期的Feed Item,如果某一个Item从Feed中删除,本地Feed Reader也会将它从本地(或者在线Feed Reader Storage)删除。


简单的说,你通过Feed Reader看到的Feed应该与Feed Publisher发布的完全一致。


这种特定应用的需求会有很多,比如典型的几种应用:



  • Top 10 Best Seller - 比如Top 10 畅销书籍,Top 10 Music等等,对这种Feed的关注通常是更加关注于当前那10个;

  • Wish List - 如果我已经得到了某个东西,就会把它从SLE中拿去,这样,订阅了我的Wish List的人也就不会再看到这个,不会送重复的东西了:);

  • Open Positions - 当前职位列表,过期的职位通常意义不大。


可以看到,这些应用都有一些共同的特点,就是Feed本身更倾向于一种通知(Notification),过期的Item意义不大,而且,通常,这个List本身的次序是很重要的。


Specification很简单,通过以下这个声明来确定某个Feed是否是SLE(支持RSS2.0 & Atom),下面是一个RSS 2.0中的例子:


[code lang="xml"]


list
Top 10 Popular Post Inderal For Sale, ..........
........., Inderal natural. Is Inderal addictive,


[/code]

Sorting和Grouping(Filtering)的规则举例:


[code lang="xml"]









[/code]

当然,SLE不止是一个针对于Feed Publisher的标准,还需要Feed Reader的支持。与一般的Feed不同,Feed Reader在处理SLE的时候会有一些特殊处理,现有的Feed Reader还基本上不支持SLE,除了IE7 Beta2。


为了试验,我做了一个简单的WordPress Most Popular Post的插件。基本的打分是采用Popular Context插件,根据留言数量,Pingback、Trackback数量,浏览数量等因素来确定一篇文章的受欢迎程度,最后,提供一个WordPress的Top 10 Popular Post的SLE,可以用IE7 Beta2订阅来看看效果。



右面可以根据Comments,Pingback,Pageview来排序,也可以Filter来选择某个作者的Post。


订阅:


Most Popular Post @ Xerdoc's Weblog


Most Popular Post @ Meng Yan's Weblog


相关阅读:


Simple List Extensions Specification


Simple List Extensions in action


Understanding Lists and SLE

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4 Responses to “Inderal For Sale”

  1. piscdong Says:

    为什么comment内容不显示啊

  2. piscdong Says:

    cf:sort ns=”http://www.xerdoc.com/rss/pl/” element=”date” …
    “http://www.xerdoc.com/rss/pl/”有什么作用?好像不能访问啊

  3. Meng Yan Says:

    to piscdong:

    It’s XML element’s namespace.

  4. PiscDong studio Says:

    网站更新(2006-05-09)…

    1、改写部分JavaScript代码
    主要是Ajax这部分代码,另外切换样式部分的程序以前是用Ajax调用PHP程序保存cookie,现在改成直接用JavaScript保存。

    2、在RSS里加入SLE(Simple List Extensions)
    接触SLE有一…

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