For <fo:simple-page-master> the writing-mode property is used to specify the placement of the five regions on the master.
For <fo:region-*> the writing-mode property defines the column-progression within each region.
For <fo:table> the writing-mode property controls the layout of the rows and columns.
|lr-tb||Default. Text are written left-to-right and top-to-bottom (normal "alphabetic" text)|
|rl-tb||Text are written right-to-left and top-to-bottom (Arabic and Hebrew text)|
|tb-rl||Text are written top-to-bottom and right-to-left (Chinese and Japanese text)|
|lr||Same as lr-tb|
|rl||Same as rl-tb|
|tb||Same as tb-rl|