Mythologies of Loss

I have been working on a UOL for Sebastian Groes of LHU to support a topic called Mythologies of Loss. An interesting aspect of this UOL is that a student is able to upload a piece of creative writing to the LD player, but can choose whether to make it available to other students to see. I have done this by setting up 3 proprties. One is a local personal property that represents the uploaded file. There is a second localpersonal property that is monitored by other students. A third property is set up for the student to set if they wish to "publish" the piece, in which case the monitored property is set to the value of the uploaded property. A proplem with this is that once the student has "published" a file, if they wish to "unpublish" it, there doesn't seem to be a way to set the monitored property to null.