Annotating the Web with Atom
http://www.ibm.com/developerworks/web/library/wa-annotate/

Ogbuji, Uche and Eric Larson
IBM
2008

Abstract:

You've seen reader comments on weblogs and other Web 2.0 sites, but the Atom protocol makes it possible to create and manage such comments in a very flexible way. Flexible Web annotations is an idea that will open up an entirely new class of Web applications with very little actual new invention. Learn how to create a system to manage annotations for anything on the Web, from nearly anywhere.