schema:             TINC-KEYSET-SCHEMA
ref:                dn42.tinc-keyset
key:                tinc-keyset  required  single    primary schema
key:                descr        optional  single
key:                remarks      optional  multiple
key:                member       required  multiple  lookup=dn42.tinc-key
key:                admin-c      optional  multiple  lookup=dn42.person,dn42.role
key:                tech-c       optional  multiple  lookup=dn42.person,dn42.role
key:                mnt-by       required  multiple  lookup=dn42.mntner
key:                source       required  single    lookup=dn42.registry
mnt-by:             DN42-MNT
source:             DN42