"print" "mailcap" rules for plain/text

[Jude DaShiell <jdashiel@shellworld.net>]

Does anyone know where these are documented?  Apparently a2ps needs at 
least one of these to go further than an error statement:
Script started on Sun 02 Aug 2009 06:06:38 AM EDT
jude@localhost:~$ cat print
#!/bin/bash
# file: print - script to print to dot matrix printer
a2ps -1m -Eplain -B --borders=no $1
jude@localhost:~$ print ./lists/biglots.txt
Error: no "print" mailcap rules found for type "text/plain"
jude@localhost:~$ exit
exit

Script done on Sun 02 Aug 2009 06:07:28 AM EDT