Paul Lindner note that the rel attribute is not for general "tagging" of a target link, this is a common misconception.
Here's an FAQ about rel: http://microformats.org/wiki/rel-faq#What_does_a_rel_value_really_mean.3F
Kevin Marks is right about brainstorming.
However, start with documenting the use case.
In this case, what's the problem you're trying to solve?
Tantek Çelik, Oct 17 2011 on 1500wordmtu.com
Paul Lindner note that the rel attribute is not for general "tagging" of a target link, this is a common misconception.
Here's an FAQ about rel: http://microformats.org/wiki/rel-faq#What_does_a_rel_value_really_mean.3F
Kevin Marks is right about brainstorming.
However, start with documenting the use case.
In this case, what's the problem you're trying to solve?
Tantek Çelik, Oct 17 2011 on 1500wordmtu.com