This is a nice write-up of making a point-map (a map with information relating to points on that map) in a semantic and accessible manner. I read a lot of articles, and rarely feel compelled to blog them. I was impressed with this one though. It doesnt shy from diggging right into the details, and does an admirable job of working through some complexity to present a real, viable solution. So many introduce a single technique and leave “the rest” as an exercise to the reader.
The author also using a definition list, which is one of my favorite constructs. My only hesitation is that DTs dont feature in the Heading heirarchy, and so as semantically appropriate as they are, you lose that implied structure in most UAs.