DiscussionMessageHeader is the Interface for a Sakai Discussion Message header.
In addition to the usual body, from and time fields of MessageHeader, discussion messages have:
Category: a selection from a limited set of strings which categorizes a message.
Subject: an unrestricted user entered text that describes the message.
ReplyTo: a message reference to which this message is a direct reply.
Draft: a value that lets us have messages that are stored but are still in the process of being created and are not publically available yet.
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