I have submitted the following changes (the numerical values
correspond to
the BarNumber object):
|side-axis| (number):
|1|
If the value is #X (or equivalently 1), the object is placed
horizontally next to the other object. If the value is #Y or 0, it is
placed vertically.
|direction| (direction):
|1|
If side-position is #X, then this property determines if the object is
placed #LEFT, #CENTER or #RIGHT with respect to the other object.
Otherwise, it determines if the object is placed #UP #CENTER or
#DOWN. Numerical values may also be used. #UP=1, #DOWN=-1, #LEFT=-1,
#RIGHT=1, CENTER=0 but also other numerical values are permitted.
I hope this will make it more clear. Note that printing the relevant
interpretation
of the default value, such as "1 (#UP)" or "1 (#LEFT)" would be just
as difficult
(if not more difficult) than being able to handle alternative text
strings for the
same property in different objects (when I said it was "probably
difficult" I
meant "with 99.9% difficult"). ;-)
Note also that you can use
\override Score.BarNumber #'direction = #-2
or
\override Score.BarNumber #'direction = #0.58
if you wish. I tried to clarify that aspect too in the text above.