returns xml fragment.
<response success="true" error="">
if success attribute is "true", the document comment has been returned like the sample below.
if success attribute is "false", the error attribute indicates the encountered
error.
<response success="true" error="">
<Comments>
<Comment AuthorID="10119" AuthorName="Adam Boeve" CommentDate="2007-08-03 15:56:03">I agree. This is a good looking document. Let's keep it the way it is.</Comment>
<Comment AuthorID="4" AuthorName="System Administrator" CommentDate="2007-08-02 12:42:11">I think this document turned out just fine.</Comment>
</Comments>
</response>