+When converting an existing blog to ikiwiki it would be useful to be able to preserve any existing UUIDs on posts, in order to avoid flooding aggregators.
+
+Also, it should be possible to change the canonical URL of a post, i.e. the atom <link> (e.g. leaving a redirector behind) while keeping the same UUID (so that aggregators don't get confused).
+
+Ideally UUIDs for blog posts should be chosen when the post is created, and frozen permanently by checking them in along with the content.
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+Perhaps ikiwiki's blogging functionality could be hooked up to the [[meta]] plugin, with a new meta keyword (uuid? feed-uuid? atom-uuid?) to achieve this.