Renderer or Writer?

I am curious what you guys think. i dont really know when to use "Renderer" and when "Writer" for a package. Just two examples: - Mail_Message_Writer writes mails i.e. to files - Query_Renderer renders a query into a string which is SQL. But shouldnt "Query_Renderer" not be called "Query_Writer" since it might also be able to have a method toFile() which writes the query to a file, which is a writer in this case. Right? But it of course also renders the query from the object presentation to a string (SQL). Or shall "Query_Writer" be an extra package (besides "Query_Renderer"), which writes queries to different destinations? i would be intersted in opinions, thanks -- Wolfram http://opensource.visionp.de ... authentication system .... http://sf.net/projects/auth