public interface DiscussionMessage extends Message(Code)
DiscussionMessage is the Interface for a Sakai Discussion message.
The discussion message has header fields (from, date) and a body (text). Each message also has an id, unique within the channel. All fields are read only.
Return the depth of replyTo value for this message. Messages that are not a reply to any other message have depth = 0. If the message is a reply to a message, this message's depth is the replyTo's depth + 1.
The depth of replyTo value for this message.