A namespace for describing discussion threads $Revision: 1.1 $ $Date: 2001/03/28 21:21:20 $ Reply A resource is a reply if one of its types is Reply. in reply to A resource, regardless of its type, is part of a discussion thread when it has an inReplyTo relationship to another resource. root of thread Every resource that is part of a discussion thread should have a root property to identify the first resource in the thread. Every resource in the thread will have the same resource as its root.