What does Map() in lua code do?

hi . i am new in Lua and reading Leds file of openwrt . but i don`t know what below statement means :

m = Map("system", translate("<abbr title=\"Light Emitting Diode\">LED</abbr> Configuration"), translate("Customizes the behaviour of the device <abbr title=\"Light Emitting Diode\">LED</abbr>s if possible."))

It's a constructor function returning an abstract form object tied to the named uci configuration file given in the first argument. There's no thorough documentation of the cbi module (the one providing Map()) but there's some basic information here: