Normally Bibledit is a graphical program, and the user interacts with it through the keyboard and the mouse.
But when arguments are passed to it on the commandline, it changes into a program suitable for scripting.
To see that, run, for example,
bibledit --version
from a terminal.
To get more information run
bibledit --help
Script bibledit-stylesheet-export exports a stylesheet to a zipped file with individual xml stylefiles.