Schematron using XPath 2.0
The attribute disp:horizontal_display_direction must be equal to one of the following values 'Left', 'Right'.
The attribute disp:vertical_display_direction must be equal to one of the following values 'Down', 'Up'.
The attribute disp:horizontal_display_direction must be equal to one of the following values 'Left', 'Right'.
The attribute disp:vertical_display_direction must be equal to one of the following values 'Down', 'Up'.
The attribute disp:loop_flag must be equal to one of the following values 'false', 'true'.
The attribute disp:loop_back_and_forth_flag must be equal to one of the following values 'false', 'true'.
The attribute disp:horizontal_display_direction must be equal to one of the following values 'Left', 'Right'.
The attribute disp:vertical_display_direction must be equal to one of the following values 'Down', 'Up'.
The attribute disp:loop_flag must be equal to one of the following values 'false', 'true'.
The attribute disp:loop_back_and_forth_flag must be equal to one of the following values 'false', 'true'.
The attribute disp:horizontal_display_direction must be equal to one of the following values 'Left', 'Right'.
The attribute disp:vertical_display_direction must be equal to one of the following values 'Down', 'Up'.