...
<entry>
  <type>Post</type>
  <url>URL</url>
  <title>The title</title>
  <content>The blog post goes here</content>
</entry>
<entry>
  <type>Comment</type>
  <in-reference-to>URL</in-reference-to>
  <title>The title of the comment</title>
  <content>The content itself</content>
</entry>
...