G'day all. Quoting Gü?nther Schmidt <gue.schmidt at web.de>: > my quest for data structures continues. Lately I came across "Zippers". > > Can anybody point be to some useful examples? This is a good example, currently in use in GHC: http://www.cs.tufts.edu/~nr/pubs/zipcfg-abstract.html Cheers, Andrew Bromage