schema:             INET6NUM-SCHEMA
ref:                dn42.inet6num
key:                inet6num    required   single    schema
key:                cidr        required   single    primary
key:                netname     required   single
key:                nserver     optional   multiple  > [domain-name]
key:                country     optional   multiple
key:                descr       optional   single
key:                status      optional   single    > {ALLOCATED|ASSIGNED} {PI|PA|}
key:                policy      optional   single    > {open|closed|ask|reserved}
key:                admin-c     optional   multiple  lookup=dn42.person,dn42.role
key:                tech-c      optional   multiple  lookup=dn42.person,dn42.role
key:                zone-c      optional   multiple  lookup=dn42.person,dn42.role
key:                ds-rdata    optional   multiple
key:                mnt-by      optional   multiple  lookup=dn42.mntner
key:                mnt-lower   optional   multiple  lookup=dn42.mntner
key:                mnt-routes  optional   multiple  lookup=dn42.mntner
key:                org         optional   single    lookup=dn42.organisation
key:                remarks     optional   multiple
key:                source      required   single    lookup=dn42.registry
network-owner:      inet6num
mnt-by:             DN42-MNT
source:             DN42