Code 128 is a continuous, multilevel, full
ASCII code. The character set consists of 103 different characters,
three different start characters and one stop character. With the
three different start characters there are three different code
subsets available. Special 'shift' characters enable code subset
switching within the encoded string.
The generator supports the whole code alphabet,
including checksum generation. Control combinations are escaped
by using the percent sign.
Besides parameters common to all stylesheets,
this barcode generator allows you to select a code subset which
will be used for data encoding. It also allows you to turn on/off
automatic addition of a special character required by UCC/EAN code.
