IRT template
irt: [mandatory] [single] [primary/look-up key]
remarks: [optional] [multiple] [ ]
address: [mandatory] [multiple] [ ]
phone: [optional] [multiple] [ ]
fax-no: [optional] [multiple] [ ]
e-mail: [mandatory] [multiple] [lookup key]
signature: [mandatory] [multiple] [ ]
encryption: [mandatory] [multiple] [ ]
admin-c: [mandatory] [multiple] [inverse key]
tech-c: [mandatory] [multiple] [inverse key]
auth: [mandatory] [multiple] [ ]
irt-nfy: [optional] [multiple] [inverse key]
notify: [optional] [multiple] [inverse key]
mnt-by: [mandatory] [multiple] [inverse key]
changed: [mandatory] [multiple] [ ]
source: [mandatory] [single] [ ]
inetnum: [mandatory] [single] [primary/look-up key]
mnt-irt: [optional] [multiple] [inverse key]