Microformats
Created by a grassroots coalition of developers, microformats add extra meaning to content through standardized markup patterns using existing attributes. Their main attraction is that they work with current development methods; rather than being an extension to HTML, they are a design principle or a set of standard usage patterns.
Microformats range from the fairly complex to the extremely simple. Here’s an example of probably the most simple of all:
<a href="http://flickr.com/photos/tags/gorilla/" rel="tag">About Gorillas</a>
That’s called the Rel-Tag microformat. The keyword tag in the rel attribute lets other machines know that the URL linked to in the a element is a page that is described by a tag, the name of which is the last ...
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