25.2 SunOS 5.X
The print job needs to match the content type of the printer, so it is necessary that every printer be associated with at least one content type. The system can use the content type to match a job to a particular printer.
The service uses the /usr/sbin/lpfilter command to call the filter that will convert the contents of a file to that accepted by the target printer. This same lpfilter command is used to register new filters with the print service.