rev-tags

Microformats.org defines the rel-tag: links with rel="tag".

When you define a rel link type, you automatically define it for rev too. From W3C:

Consider two documents A and B.
Document A: <LINK href="docB" rel="foo">
Has exactly the same meaning as:
Document B: <LINK href="docA" rev="foo">

So when I tag this entry with , Technorati could use rev="tag" on the link back.

And I think they should. Because the Tags page contains many links. Some are links to pages with the tag, others are not. A human can see the difference from the layout, but robots don't read layout. It would be useful for a search robot to know that all links with rev="tag" have something in common with each other, and with the last segment of the page's URL.

At Technorati, anyone can get a link back when they tag their own page. At sites like http://hoppa.com/, anyone could also tag their page as e.g. http://hoppa.com/Search_Engines/. But that will not give an automatic link back, because Hoppa is edited. In such cases, rev="tag" would be even more valuable to search engines.

But to be tag compatible, the URL should probably have been http://hoppa.com/Search+Engines/. Still, Hoppa is better off than DMOZ, where the page that is listing weblog search engines has the tag Search_Engines, which is far more general than the content of the page.


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