dxcalendar data file

[Rusty Wright]

Does anybody know what the format is of the dxcalendar file
(.dxcalendar.dwc)?  I'd like to write a little program that reads it
converts it to plain ascii so that I can (hopefully) add entries in it
to my ~/calendar file so notification will also get mailed to me.  I
don't see anywhere in the dxcalendar man page any explanation of the
file format or any pointers to what the file format is or might be.