Tau Expressions

copying involves conversion

	map.xtm > io:stdout
      

	map.atm > map.xtm
      

	me.foaf > me.atm
      

	null: > rdb:mysql:host:students
      

	stdin: > my-map.dbm
        my-map.dbm > stdout:
        my-map.dbm > -
      

	new-data.atm >> existing-data.atm