There are a number of standards for supporting 'tags' in RSS including:

dc:subject RSS 2.0 'category' mod_taxonomy

How are we going to build a generic API that supports all systems currently in use?

RSS 2.0

<category> sub-element of <item> 

<category> is an optional sub-element of <item>.

It has one optional attribute, domain, a string that identifies a categorization taxonomy.

The value of the element is a forward-slash-separated string that identifies a hierarchic location in the indicated taxonomy. Processors may establish conventions for the interpretation of categories. Two examples are provided below:

<category>Grateful Dead</category>

<category domain="">MSFT</category>

You may include as many category elements as you need to, for different domains, and to have an item cross-referenced in different parts of the same domain.


<rdf:li resource=""/>


Technorati tags seems proprietary:

To contribute to this tag, just make a post to your blog about met and include a link to this page like so:

<a href="" rel="tag">met</a>


Furl also supports tags:

And the resulting XML would include:

<guid isPermaLink="true"></guid>
<pubDate>Wed, 19 Jan 2005 19:21:32 GMT</pubDate>

Ideal HTML specification


  * @param tagname The local name of the tag.  IE 'linux'
  * @param URI the URI ot the tag (if invalid null).  This is used for tagging 
  * systems that use URI.  When these systems use URIs the tagname is the last
  * path component of the URI.
 onTag( String tagname, String uri ): void

TagMetaDataEvents (last edited 2009-09-20 23:48:44 by localhost)