increase arrow length and annotate objects in XYpic

[Eisa Ayed]

Hello everyone . 

i'm wondering how can I increase the arrow length in xypic. 
i.e. 
\xymatrix{*++[F]{A} \ar@{-}[r]{(0,0),(1,1)}&*++[F]{B}}

also how can i annotate the objects A and B ( i want to write their domain 
values ) something like:
[1,2,3]                           [4,5,6] 
A                                       B

thanks in advance,