The "atom:id" element conveys a permanent, universally unique
identifier for an entry or feed.
[…]
Its content MUST be an IRI, as defined by [RFC3987]. Note that the
definition of "IRI" excludes relative references.
not sure this is a problem in practice, and it seems like it would make it impossible for you to move your blog to another url. if we do fix it though, we should do that soon, because i think it will clobber everyone’s feed readers with unreads.
rfc 4287 § 4.2.6 says:
not sure this is a problem in practice, and it seems like it would make it impossible for you to move your blog to another url. if we do fix it though, we should do that soon, because i think it will clobber everyone’s feed readers with unreads.