It's not official reference link, but it imho should help you:
hi, thanks for your reply.
the pdf link which you have refered is not belongs to jboss 6.x architecture, its JBossAS5 , kindly send some other jboss 6.x architecture links.
Thanks & regards,
AS6 is basically the same architecture, with small changes; e.g. VFS2 --> VFS3.