dns_soa_record 成员列表

成员的完整列表，这些成员属于 dns_soa_record,包括所有继承而来的类成员

expire	dns_soa_record
minimum	dns_soa_record
mname	dns_soa_record
refresh	dns_soa_record
retry	dns_soa_record
rname	dns_soa_record
serial	dns_soa_record