XmStringDirection
is the data type for specifying the direction in which the system
displays characters of a string, or characters of a segment of a
compound string.
This is an enumeration with three possible values:
XmSTRING_DIRECTION_L_TO_R
Specifies left to right display
XmSTRING_DIRECTION_R_TO_L
Specifies right to left display
XmSTRING_DIRECTION_DEFAULT
Specifies that the display direction will be set by the widget in
which the compound string is to be displayed.