"XFN™ (XHTML Friends Network) is a simple way to represent human relationships using hyperlinks.... XFN enables web authors to indicate their relationship(s) to the people in their blogrolls simply by adding a 'rel' attribute to their <a href> tags,..."
R. Khare, and T. Çelik. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 865-866. New York, NY, USA, ACM Press, (2006)
R. Khare, and T. Celik. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 865--866. New York, NY, USA, ACM Press, (2006)