go to the cvs and download the library(!)-source (\"libbedic\"). In this package you will find the format description (in the doc directory).
However the dictionary you create that way will have some failures, so run after your creation the tool xerox, which sourcecode you will find in the tools directory to generate a valid dictionary (from your broken one).
I\'ve done it that way, and it works.
Zbedic is great, especialy because Justreader can use the dictionarys. :-)
have phun
trilo