The maplist is a list with all maps from the rotation file and voted maps. You can get it, if you type "maplist" into the console. The voted maps are bracketed (never heard this word before...). This option make more sense, if the full voting was enabled on the server and you want only this maps or if you want to add some maps to the rotation manually without saving it to the rotation file.
The maps from the rotation file are only the maps, which you typed into the rotation.txt.