New objects
rtr-set: [mandatory] [single] [primary/look-up key]
descr: [mandatory] [multiple]
members: [optional] [multiple]
mbrs-by-ref: [optional] [multiple]
remarks: [optional] [multiple]
tech-c: [mandatory] [multiple] [inverse key]
admin-c: [mandatory] [multiple] [inverse key]
notify: [optional] [multiple] [inverse key]
mnt-by: [mandatory] [multiple] [inverse key]
changed: [mandatory] [multiple]
source: [mandatory] [single]
Supported in updates, not yet in queries