For Common Edition(CE) in Sienna,it includes that of fuel economy,transmission and warranty engine.
For Limited Edition(LE) in Sienna,its features includes:easy-clean fabric,a reconfigurable 2nd-row seat and power sliding doors.
For All Wheel Drive Edition(AWD) in Sienna,sometimes we need to go places when the weather conditions are far from ideal.Sienna is the only minivan sold in America that offers an available All Wheel Drive system.
For Xtra Limited Edition(XLE) in Sienna,it adds advanced safety features,it helps keep the drivers and passengers a good comfort,its features includes:leather-trimmed and multi-stage heated front seats,power adjusted drivers and passengers seat,smart key system with push button start,power tilt/slide moonroof,etc.
The differences between these CE,LE,AWD AND XLE are:
CE: it is very basic,no options,you can add side airbags,DVD/NAV system.
LE: it has some options(one power door)
AWD: similar to that of XLE,it sort of contains higher trim package to get some things.
XLE: it has 3 power doors(2 sides and lift gates) which i believe is standard.XLE is said to be everything amongst the sienna editions.