use types instead of maps

proto/gosdn/gosdn.pb.go

 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0-devel
-// 	protoc        v3.15.7
+// 	protoc        v3.15.8
 // source: proto/gosdn/gosdn.proto
 
 package gosdn

proto/gosdn/pnd/pnd.proto

@@ -28,7 +28,7 @@ message GetRequest {
 
 message GetResponse {
   int64 timestamp = 1;          // Timestamp in nanoseconds since Epoch.
-  oneof get_oneof {
+  oneof payload {
     PrincipalNetworkDomain pnd = 2;
     OrchestratedNetworkingDevice ond = 3;
     OrchestratedNetworkingDevices onds = 4;
@@ -43,9 +43,9 @@ message PrincipalNetworkDomain {
   string id = 1;
   string name = 2;
   string description = 3;
-  map<string, OrchestratedNetworkingDevice> onds = 4;
-  map<string, SouthboundInterface> sbis = 5;
-  map<string, Change> changes = 6;
+  OrchestratedNetworkingDevices onds = 4;
+  SouthboundInterfaces sbis = 5;
+  Changes changes = 6;
 }
 
 message SouthboundInterface {