If you were using the Thread Description Language <http://www.eyrie.org/~zednenem/2002/web-threads/>, you would use "repliesTo", the theory being that an author replying to his- or herself is following up on what was previously written. For corrections, you can use "disagreesWith", a subproperty of "repliesTo".

Earlier versions also provided explicit "followsUp" and "corrects" properties, but I took them out in an effort to simplify.

Now that I know TDL exists :-), I'll probably make the switch. Thanks for the pointer.

These links are still examples of other kinds of relationships, so I think my point is still relevant.

I suppose the nearest approximation to threading in the DC terms is 'references/is referenced by'. If we think in terms of published books or journal papers rather than weblog entries then this makes sense; a book or paper that is published in response to another would indicate it by citing the first book as a reference. It seems strange to use that terminology with paragraphs typed in to a comment form, but I suppose that's the expected result of applying metadata designed for substantive works to individual web pages...

The mail and news header 'References' is used to represent similar relationships.