Codabar is a discrete, width-modulated barcode
that can encode digits 0 to 9, plus six special characters: '$'
(dollar sign), '-' (dash), ':' (colon), '/' (slash), '.' (period),
and '+' (plus). There are also start/stop characters A, B, C, and
D.
Besides the parameters common to all stylesheets,
this barcode generator allows you to select start/stop symbols.
There is no checksum for this barcode.
