complete -c ofdns -s c -l class -x -d 'The DNS class to query (defaults to IN)'
complete -c ofdns -s h -l help -d 'Show help'
complete -c ofdns -s s -l server -x -d 'The server to query'
complete -c ofdns -s t -l type -x \
    -d 'The record type to query (defaults to ALL, can be repeated)'
