I'm combing through and doing a bunch of SEO work for a lot of the blogs on my site, as I've learned a lot of new tips and tricks, and came across one of the authors who made use of this relationship, and I'm not exactly sure what it does.

After looking around a bit on the web, there are varying opinions ranging from it does nothing, to creating a more advanced permalink.

Regardless, I am removing it, but was just wondering what he was intending by adding it.