Update 1: Wow, apparently using Atom as an example was a bad idea given the number of people with their knickers in a twist. Update 2: Fixed the URI Template to accomodate Sam's nose. Update 3: Good feedback from Tim Bray, Mark Nottingham, and Rob Sayre. There are times when you have a large representation of a resource and only want to edit a small part of that resource. Wikipedia is a good examp