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
http://blogs.law.harvard.edu/tech/rss#ltcategorygtSubelementOfLtitemgt
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<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="http://www.fool.com/cusips">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. |
Delicious
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<taxo:topics> <rdf:Bag> <rdf:li resource="http://del.icio.us/tag/programming"/> </rdf:Bag> </taxo:topics> |
Technorati
Technorati tags seems proprietary:
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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="http://technorati.com/tag/met" rel="tag">met</a> |
Furl
Furl also supports tags:
http://www.furl.net/members/rss.xml?topic=technology
And the resulting XML would include:
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<category>Technology</category> <dc:creator>ggussis</dc:creator> <guid isPermaLink="true">http://www.furl.net/item.jsp?id=1741406</guid> <pubDate>Wed, 19 Jan 2005 19:21:32 GMT</pubDate> <furl:rating>3</furl:rating> <furl:clipping/> |
Ideal HTML specification
http://www.peerfear.org/rss/permalink/2005/01/18/TechnoratiTagAPIIsBroken/
Interface
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/** * @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 |