I don't think that there are any wiki entries for Data Groups.
These are a couple of discussions about them. There is a good base example in the second link.
v9 Command: matchclass
v10 Command: class match (matchclass is still usable but prevents some new v10 functionality).
http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/asg/50/afv/topic/aft/1172225/aff/5/showtab/groupforums/Default.aspx
http://devcentral.f5.com/Forums/tabid/1082223/asg/50/showtab/groupforums/afv/topic/aff/5/aft/1176925/Default.aspx
Let me know if this helps.