GNAT Users Guide *online* ?

[Toshitaka Kumano]

I appreciate to see GNAT Reference Manual *online*;
(B< http://gcc.gnu.org/onlinedocs/ > says
(B-- BEGIN
(B               GCC online documentation 
(B
(BLatest releases
(B
(BThese are manuals for the latest full releases.
(B
(B    GCC 3.1.1 manuals: 
(B(snip)
(B        GCC 3.1.1 GNAT Reference Manual (also in PostScript) 
(B-- END
(B
(B
(BOn the other hand, I cannot find "GNAT Users Guide" online; a simple guess
(B< http://gcc.gnu.org/onlinedocs/gcc-3.1.1/gnat_ug/ > makes "Not Found".
(B
(BWork in progress, or it is at other URL ?
(B
(BThank you.
(B-- 
(BToshitaka Kumano
(BKamakura, Japan