Json visitor and MAFileModel

Hello-- Newbie here. :-) I'm writing a Json visitor for a project and I'd like to stream MAFileModel on it but I'm at a loss about how to proceed. For most simple descriptions, streaming the value is just a matter of rendering the value according to the description using the normal visitor pattern. However, MAFileModel is a full-blown class and doesn't have a corresponding description to guide the process. What would be the most interesting path here: add the required descriptions to the classes or just go ahead and stream the attributes? It seems to me that the second options make the Json visitor to tightly coupled to the MAFileModel class. On the other hand, adding the descriptions may not be that interesting because it would mean changing a Magritte base class. Any suggestions? Thanks. :-) -- Ronaldo Ferraz http://log.reflectivesurface.com