Created attachment 28817 [details] Test provided by Jonathan Levinson. [Needs to be simplified] When writing-mode='tb-rl' is specified on fo:simple-page-master, the fo:region-start area should appear on right, while the fo:region-end area should appear on left.
Created attachment 28818 [details] Output of test provided by Jonathan Levinson.
Created attachment 28820 [details] Simplified FO for this problem I provide simplified FO. With the simplified FO I don't see the problem with writing-mode="RL" giving invalid start and end regions. Start is right and end is left as I would expect. I will also attach the generated PDF.
Created attachment 28821 [details] PDF corresponding to simplified FO.