schema:             AUT-NUM-SCHEMA
ref:                dn42.aut-num
key:                aut-num    required  single   primary schema
key:                as-name    required  single
key:                descr      optional  single
key:                mnt-by     required  multiple lookup=dn42.mntner
key:                member-of  optional  multiple lookup=dn42.as-set,dn42.route-set
key:                admin-c    optional  multiple lookup=dn42.person,dn42.role
key:                tech-c     optional  multiple lookup=dn42.person,dn42.role
key:                org        optional  single   lookup=dn42.organisation
key:                import     deprecate multiple
key:                export     deprecate multiple
key:                default    deprecate multiple
key:                mp-peer    deprecate multiple
key:                mp-group   deprecate multiple
key:                mp-import  optional  multiple
key:                mp-export  optional  multiple
key:                mp-default optional  multiple
key:                geo-loc    optional  multiple > [lat-c] [long-c] [name]
key:                remarks    optional  multiple
key:                source     required  single    lookup=dn42.registry
mnt-by:             DN42-MNT
source:             DN42
