Hallo
I search for it and did notsucceeded.
Where is exact definition of the grammar used here?
I thing the text "[,...]" is unclear concerning what is to be repeted.
here:
you state
" Dots (...) mean that the preceding element can be repeated. "
from that definition the fragment "[,...]" means zero or more commas.
It is often so that not one element but several elements are repeated .
Sometimes from the context, one may find out how it is meant.
In other cases it not so clear .
Well do you have a definition or third party standard?
Thank you very much,Peter Korim.
