the add_generic_record and set_generic_record tools use a format string
to pack the data properly. since both take the same arguments, i'll
refer to both as $GENERIC

this document lists the format-specifications needed to make various
kinds of generic records.

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to make a RP (responsible person):

$GENERIC 37 'A' emailaddress


to make a SRV (service locator):

$GENERIC 33 'nnnA' priority weight port targetdns


more to come!