That really depends on local policy. It could be that an AS x present on multiple IXes (assuming another peer AS y is present on the same IXes) prefers sending traffic for AS y on IX t, while AS y prefers sending traffic for AS x on IX v.
Of course, the goal is to transport traffic in many directions, but in essence only routing information is explicitly exchanged.
Of course, the goal is to transport traffic in many directions, but in essence only routing information is explicitly exchanged.