Using the Atom Publishing Protocol, also known as AtomPub, you can comment on blog posts that you authored.
To add a comment to a blog posting, send a comment Atom entry document to the web address specified in the href attribute of the Comments <collection> element of the blog as specified in the service document or send the comment Atom entry document directly to the comments feed. Include the ID of the blog posting that you are commenting on in the comment Atom entry.
Retrieving a blog comment
To retrieve a blog posting comment, use the edit link found in the comment entry in the blog's Comments Atom publishing collection.
To delete a comment from a blog posting, use the HTTP DELETE method.