Lists and Headers

Question: If you were going to annotate a list (ul, dl, ol) so that it had
some sort of description, and do it in an A11Y way, how would you do it?  I
am thinking especially of long lists where a URI might point into the
middle of it, and it might be challenging for a non-sighted user to quickly
understand the context.  aria-describedby on each item?  A caption (if
captions worked for lists)?

-- 
Shane McCarron
Managing Director, Applied Testing and Technology, Inc.