Dns.Name_rr_mapSourceName resource record map
This map uses the resource record map above as value in a domain name map. Common DNS queries and answers have this structure as their value.
The type of a Domain_name map whose values are resource record sets. Observable in the answer and authority sections of a DNS packet.
equal a b is true when a and b contain the same keys and values, false otherwise.
add name rr_typ rr_set map adds the binding name -> rr_typ, rr_set to map, if already present, Rr_map.union_rr is applied for merging.
find name rr_typ map returns the rr_set for name, rr_typ if present, None otherwise.
remove_sub map sub removes all name, rr_key from map that are present in sub. Their values rr_set are not compared.
singleton name rr_typ rr_set constructs a t with the single entry name, rr_typ mapped to rr_set.
union a b is union of a and b, using Rr_map.unionee.