During a discussion on Sam's blog [1] it was pointed out that a requirement on the the self link was mysteriously dropped between two draft versions of rfc4287 without any discussion or notice. This change was not caught at the time and has led to a situation in which a valid self link can fail to meet the requirements that led to the creation of the self link in the first place. While it's a minor issue that is easy to work around using xml:base and software that fully implements support for relative uri's, it is somewhat disconcerting that the change was made in the first place.
[1] http://intertwingly.net/blog/2007/09/15/One-More-Step-Forward#c1190194512
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