--- a/doc/v2_planning/dataset.txt	Wed Sep 15 12:12:34 2010 -0400
+++ b/doc/v2_planning/dataset.txt	Wed Sep 15 12:23:27 2010 -0400
@@ -182,6 +182,16 @@
 can be shared between datasets that exist in one modality (e.g. image datasets
 can all use an image-rending method)
 
+OD replies: Besides being able to display data without prior knowledge of the
+kind of data inside a dataset, is there any reason to put this within the
+dataset class? If not, it seems to me it may be more appropriate to have a way
+for the dataset to describe the kind of data it holds, and keep the
+visualization code separate from the dataset itself. It would make it easier
+in particular to try different visualization systems, and description of the
+data may turn out to be useful for other reasons (however, it also means we'd
+need to come up with a good way to describe data, which could prove
+difficult).
+
 JB asks: What may be passed as argument to the functions in Dataset, and what
 can be expected in return?  Are there side effects (e.g. on the state of the
 Dataset) associated with any of the functions?