Uh... Julia's always seemed about 100x more leg-based than anything I've seen from it so far.
At any rate, both Julia and Xiaoyu are supposed to use an amalgam of a number of martial arts (Chinese or otherwise)--only in Xiaoyu's case, they mentioned Baji among them. (I assumed because someone or another noticed a few moves that lined up.) Hakke Ken and Hike Ken are among the only "official" styles named. (Whatever they may be.)
Julia isn't a good representation of Baji. Xiaoyu however is a pretty good representation of Pigua (Hika-ken) and Bagua (Hakke-sho). I am familiar with those martial arts. Beside if you open PS2 TTT manual, I am pretty sure they'll list Hakkyokuken as one of Julia style. I am positive my memory hasn't fail me on that one.
Official comments from Namco seem to only mention http://[URL="http://[B" Xing Yi in connection to Julia, while Michelle got "Kempo + various." But considering how much holdover there is from Michelle to Julia...
Baji will incorporate elements of Xing Yi and Pigua into their repertoire. Even VF Akira has Xing Yi. Some other videogame representation of Xing Yi would be Tekken Wang and DoA Genfu and Eliot.