home.md

 ```plantuml
 @startuml
 namespace nucleus {
+    class Change << (S,Aquamarine) >> {
+        - cuid uuid.UUID
+        - duid uuid.UUID
+        - timestamp time.Time
+        - previousState ygot.GoStruct
+        - intendedState ygot.GoStruct
+        - committed bool
+        - confirmed bool
+        - inconsistent bool
+        - callback <font color=blue>func</font>(ygot.GoStruct, ygot.GoStruct) error
+        - lock sync.RWMutex
+        - cancelFunc context.CancelFunc
+        - errChan <font color=blue>chan</font> error
+        - done <font color=blue>chan</font> int
+
+        - rollbackHandler(ctx context.Context) 
+
+        + ID() uuid.UUID
+        + Commit() error
+        + Confirm() error
+        + Age() time.Duration
+        + State() pnd.Change_State
+
+    }
+    class ChangeStore << (S,Aquamarine) >> {
+        + Get(id uuid.UUID) (*Change, error)
+
+    }
     class ClientConfig << (S,Aquamarine) >> {
         + Identifier string
         + Endpoint string
@@ -10,85 +38,53 @@ namespace nucleus {
         + GjsonConnectionsPath string
 
     }
-    class Core << (S,Aquamarine) >> {
-        - database database.Database
-        - pndc pndStore
-        - sbic sbiStore
-        - httpServer *http.Server
-        - stopChan <font color=blue>chan</font> os.Signal
+    class CommonDevice << (S,Aquamarine) >> {
+        - sbi SouthboundInterface
+        - transport Transport
+        - name string
 
-    }
-    class Device << (S,Aquamarine) >> {
         + UUID uuid.UUID
-        + SBI SouthboundInterface
-        + Transport Transport
-
-        + ID() uuid.UUID
-
-    }
-    class ErrAlreadyExists << (S,Aquamarine) >> {
-        - item <font color=blue>interface</font>{}
-
-        + Error() string
-
-    }
-    class ErrInvalidParameters << (S,Aquamarine) >> {
-        - f <font color=blue>interface</font>{}
-        - r <font color=blue>interface</font>{}
 
-        + Error() string
+        - isDevice() 
 
-    }
-    class ErrInvalidTransportOptions << (S,Aquamarine) >> {
-        - t <font color=blue>interface</font>{}
-
-        + Error() string
-
-    }
-    class ErrInvalidTypeAssertion << (S,Aquamarine) >> {
-        - v <font color=blue>interface</font>{}
-        - t <font color=blue>interface</font>{}
-
-        + Error() string
-
-    }
-    class ErrNil << (S,Aquamarine) >> {
-        + Error() string
-
-    }
-    class ErrNilClient << (S,Aquamarine) >> {
-        + Error() string
-
-    }
-    class ErrNotFound << (S,Aquamarine) >> {
-        - id <font color=blue>interface</font>{}
-
-        + Error() string
-
-    }
-    class ErrNotYetImplemented << (S,Aquamarine) >> {
-        + Error() string
+        + ID() uuid.UUID
+        + Model() ygot.GoStruct
+        + Transport() Transport
+        + Name() string
+        + SBI() SouthboundInterface
+        + SetTransport(t Transport) 
+        + SetName(n string) 
+        + SetSBI(sbi SouthboundInterface) 
+        + ProcessResponse(resp proto.Message) error
 
     }
-    class ErrOperationNotSupported << (S,Aquamarine) >> {
-        - o <font color=blue>interface</font>{}
+    interface Device  {
+        - isDevice() 
 
-        + Error() string
+        + ID() uuid.UUID
+        + Model() ygot.GoStruct
+        + Transport() Transport
+        + Name() string
+        + SBI() SouthboundInterface
+        + ProcessResponse( proto.Message) error
 
     }
-    class ErrUnsupportedPath << (S,Aquamarine) >> {
-        - p <font color=blue>interface</font>{}
+    class DeviceStore << (S,Aquamarine) >> {
+        - deviceNameToUUIDLookup <font color=blue>map</font>[string]uuid.UUID
 
-        + Error() string
+        + Get(id uuid.UUID, parseErrors ...error) (Device, error)
+        + Add(item Storable, name string) error
+        + Delete(id uuid.UUID) error
 
     }
     class Gnmi << (S,Aquamarine) >> {
         - client gnmi.GNMIClient
+        - config *gnmi.Config
 
         + SetNode <font color=blue>func</font>(*yang.Entry, <font color=blue>interface</font>{}, *gnmi.Path, <font color=blue>interface</font>{}, ...ytypes.SetNodeOpt) error
         + RespChan <font color=blue>chan</font> *gnmi.SubscribeResponse
         + Unmarshal <font color=blue>func</font>([]byte, []string, <font color=blue>interface</font>{}, ...ytypes.UnmarshalOpt) error
-        + Options *GnmiTransportOptions
+        + Options *transport.TransportOption
 
         - applyDiff(ctx context.Context, payload ...<font color=blue>interface</font>{}) error
         - get(ctx context.Context, paths [][]string, origin string) (<font color=blue>interface</font>{}, error)
@@ -96,8 +92,6 @@ namespace nucleus {
         - set(ctx context.Context, setOps []*gnmi.Operation, exts ...*gnmi_ext.Extension) (*gnmi.SetResponse, error)
         - subscribe(ctx context.Context) error
 
-        + SetOptions(to TransportOptions) 
-        + GetOptions() <font color=blue>interface</font>{}
         + Get(ctx context.Context, params ...string) (<font color=blue>interface</font>{}, error)
         + Set(ctx context.Context, args ...<font color=blue>interface</font>{}) error
         + Subscribe(ctx context.Context, params ...string) error
@@ -105,17 +99,8 @@ namespace nucleus {
         + ProcessResponse(resp <font color=blue>interface</font>{}, root <font color=blue>interface</font>{}, s *ytypes.Schema) error
         + Capabilities(ctx context.Context) (<font color=blue>interface</font>{}, error)
         + Close() error
-
-    }
-    class GnmiTransportOptions << (S,Aquamarine) >> {
-        + SetNode <font color=blue>func</font>(*yang.Entry, <font color=blue>interface</font>{}, *gnmi.Path, <font color=blue>interface</font>{}, ...ytypes.SetNodeOpt) error
-        + Unmarshal <font color=blue>func</font>([]byte, []string, <font color=blue>interface</font>{}, ...ytypes.UnmarshalOpt) error
-        + RespChan <font color=blue>chan</font> *gnmi.SubscribeResponse
-
-        + GetAddress() string
-        + GetUsername() string
-        + GetPassword() string
-        + IsTransportOption() 
+        + SetPassthrough(ctx context.Context, req *gnmi.SetRequest) (*gnmi.SetResponse, error)
+        + GetPassthrough(ctx context.Context, req *gnmi.GetRequest) (*gnmi.GetResponse, error)
 
     }
     class OpenConfig << (S,Aquamarine) >> {
@@ -127,27 +112,33 @@ namespace nucleus {
         + SetNode() <font color=blue>func</font>(*yang.Entry, <font color=blue>interface</font>{}, *gnmi.Path, <font color=blue>interface</font>{}, ...ytypes.SetNodeOpt) error
         + Unmarshal() <font color=blue>func</font>([]byte, []string, <font color=blue>interface</font>{}, ...ytypes.UnmarshalOpt) error
         + ID() uuid.UUID
+        + Type() southbound.Type
+
+    }
+    class PndStore << (S,Aquamarine) >> {
+        + Get(id uuid.UUID) (PrincipalNetworkDomain, error)
 
     }
     interface PrincipalNetworkDomain  {
         + Destroy() error
         + AddSbi( <font color=blue>interface</font>{}) error
         + RemoveSbi( uuid.UUID) error
-        + AddDevice( <font color=blue>interface</font>{}) error
-        + GetDevice(uuid uuid.UUID) (ygot.GoStruct, error)
+        + AddDevice(name string, opts *transport.TransportOption, sid uuid.UUID) error
+        + GetDevice(identifier string) (<font color=blue>interface</font>{}, error)
         + RemoveDevice( uuid.UUID) error
         + Devices() []uuid.UUID
-        + ChangeOND(uuid uuid.UUID, operation <font color=blue>interface</font>{}, path string, value ...string) error
+        + ChangeOND(uuid uuid.UUID, operation pnd.ApiOperation, path string, value ...string) error
         + Request( uuid.UUID,  string) error
         + RequestAll( string) error
         + GetName() string
         + GetDescription() string
-        + MarshalDevice( uuid.UUID) (string, error)
+        + MarshalDevice( string) (string, error)
         + ContainsDevice( uuid.UUID) bool
         + GetSBIs() <font color=blue>interface</font>{}
         + ID() uuid.UUID
-        + Pending() []uuid.UUID
-        + Committed() []uuid.UUID
+        + PendingChanges() []uuid.UUID
+        + CommittedChanges() []uuid.UUID
+        + GetChange( uuid.UUID,  ...int) (<font color=blue>interface</font>{}, error)
         + Commit( uuid.UUID) error
         + Confirm( uuid.UUID) error
 
@@ -160,75 +151,71 @@ namespace nucleus {
         + GetOptions() <font color=blue>interface</font>{}
         + ProcessResponse(resp <font color=blue>interface</font>{}, root <font color=blue>interface</font>{}, models *ytypes.Schema) error
 
+    }
+    class SbiStore << (S,Aquamarine) >> {
+        + Get(id uuid.UUID) (SouthboundInterface, error)
+
     }
     interface SouthboundInterface  {
         + SbiIdentifier() string
         + SetNode() <font color=blue>func</font>(*yang.Entry, <font color=blue>interface</font>{}, *gnmi.Path, <font color=blue>interface</font>{}, ...ytypes.SetNodeOpt) error
         + Schema() *ytypes.Schema
         + ID() uuid.UUID
+        + Type() southbound.Type
 
     }
     interface Storable  {
         + ID() uuid.UUID
 
     }
-    class Tapi << (S,Aquamarine) >> {
+    interface Store  {
+        + Exists(id uuid.UUID) bool
+        + Add(item Storable) error
+        + Get(id uuid.UUID) (Storable, error)
+        + Delete(id uuid.UUID) error
+        + UUIDs() []uuid.UUID
+
     }
     interface Transport  {
         + Get(ctx context.Context, params ...string) (<font color=blue>interface</font>{}, error)
         + Set(ctx context.Context, params ...<font color=blue>interface</font>{}) error
         + Subscribe(ctx context.Context, params ...string) error
         + Type() string
-        + GetOptions() <font color=blue>interface</font>{}
         + ProcessResponse(resp <font color=blue>interface</font>{}, root <font color=blue>interface</font>{}, models *ytypes.Schema) error
 
     }
-    interface TransportOptions  {
-        + GetAddress() string
-        + GetUsername() string
-        + GetPassword() string
-        + IsTransportOption() 
+    class csbiDevice << (S,Aquamarine) >> {
+        - isDevice() 
 
-    }
-    class YANGConsumer << (S,Aquamarine) >> {
-        + Data *bytes.Buffer
-
-        + Consume(reader io.Reader, _ <font color=blue>interface</font>{}) error
-
-    }
-    class changeStore << (S,Aquamarine) >> {
-        - get(id uuid.UUID) (*pnd.Change, error)
-
-    }
-    class deviceStore << (S,Aquamarine) >> {
-        - get(id uuid.UUID) (*Device, error)
+        + ID() uuid.UUID
+        + Model() ygot.GoStruct
+        + Transport() Transport
+        + Name() string
+        + SBI() SouthboundInterface
+        + ProcessResponse(resp proto.Message) error
 
-    }
-    class nucleus.CtxKeyType << (T, #FF7700) >>  {
-    }
-    class nucleus.Operation << (T, #FF7700) >>  {
     }
     class nucleus.store << (T, #FF7700) >>  {
     }
     class pndImplementation << (S,Aquamarine) >> {
         - name string
         - description string
-        - sbic sbiStore
-        - devices deviceStore
-        - pendingChanges changeStore
-        - committedChanges changeStore
-        - confirmedChanges changeStore
+        - sbic SbiStore
+        - devices *DeviceStore
+        - pendingChanges ChangeStore
+        - committedChanges ChangeStore
+        - confirmedChanges ChangeStore
         - id uuid.UUID
         - errChans <font color=blue>map</font>[uuid.UUID]<font color=blue>chan</font> error
 
         - addSbi(sbi SouthboundInterface) error
         - removeSbi(id uuid.UUID) error
-        - addDevice(device *Device) error
-        - getDevice(id uuid.UUID) (*Device, error)
+        - addDevice(device Device) error
         - removeDevice(id uuid.UUID) error
 
-        + Pending() []uuid.UUID
-        + Committed() []uuid.UUID
+        + PendingChanges() []uuid.UUID
+        + CommittedChanges() []uuid.UUID
+        + GetChange(cuid uuid.UUID, i ...int) (<font color=blue>interface</font>{}, error)
         + Commit(u uuid.UUID) error
         + Confirm(u uuid.UUID) error
         + ID() uuid.UUID
@@ -240,29 +227,20 @@ namespace nucleus {
         + Destroy() error
         + AddSbi(sbi <font color=blue>interface</font>{}) error
         + RemoveSbi(id uuid.UUID) error
-        + AddDevice(device <font color=blue>interface</font>{}) error
-        + GetDevice(uuid uuid.UUID) (ygot.GoStruct, error)
+        + AddDevice(name string, opt *transport.TransportOption, sid uuid.UUID) error
+        + GetDevice(identifier string) (<font color=blue>interface</font>{}, error)
         + RemoveDevice(uuid uuid.UUID) error
-        + MarshalDevice(uuid uuid.UUID) (string, error)
+        + MarshalDevice(identifier string) (string, error)
         + Request(uuid uuid.UUID, path string) error
         + RequestAll(path string) error
-        + ChangeOND(uuid uuid.UUID, operation <font color=blue>interface</font>{}, path string, value ...string) error
-
-    }
-    class pndStore << (S,Aquamarine) >> {
-        - get(id uuid.UUID) (PrincipalNetworkDomain, error)
-
-    }
-    class sbiStore << (S,Aquamarine) >> {
-        - get(id uuid.UUID) (SouthboundInterface, error)
+        + ChangeOND(uuid uuid.UUID, operation pnd.ApiOperation, path string, value ...string) error
 
     }
     class store << (S,Aquamarine) >> {
-        - exists(id uuid.UUID) bool
-        - add(item Storable) error
-        - get(id uuid.UUID) (Storable, error)
-        - delete(id uuid.UUID) error
-
+        + Exists(id uuid.UUID) bool
+        + Add(item Storable) error
+        + Get(id uuid.UUID) (Storable, error)
+        + Delete(id uuid.UUID) error
         + UUIDs() []uuid.UUID
 
     }
@@ -270,24 +248,26 @@ namespace nucleus {
         'This class was created so that we can correctly have an alias pointing to this name. Since it contains dots that can break namespaces
     }
 }
-"ygot.GoStruct" *-- "nucleus.Device"
-"gnmi.Config" *-- "nucleus.GnmiTransportOptions"
-"nucleus.store" *-- "nucleus.changeStore"
-"nucleus.store" *-- "nucleus.deviceStore"
-"nucleus.store" *-- "nucleus.pndStore"
-"nucleus.store" *-- "nucleus.sbiStore"
-
-"nucleus.Storable" <|-- "nucleus.Device"
+"nucleus.store" *-- "nucleus.ChangeStore"
+"ygot.GoStruct" *-- "nucleus.CommonDevice"
+"nucleus.store" *-- "nucleus.DeviceStore"
+"nucleus.store" *-- "nucleus.PndStore"
+"nucleus.store" *-- "nucleus.SbiStore"
+"nucleus.CommonDevice" *-- "nucleus.csbiDevice"
+
+"nucleus.Storable" <|-- "nucleus.Change"
+"nucleus.Device" <|-- "nucleus.CommonDevice"
+"nucleus.Storable" <|-- "nucleus.CommonDevice"
 "nucleus.Transport" <|-- "nucleus.Gnmi"
-"nucleus.TransportOptions" <|-- "nucleus.GnmiTransportOptions"
 "nucleus.SouthboundInterface" <|-- "nucleus.OpenConfig"
 "nucleus.Storable" <|-- "nucleus.OpenConfig"
 "nucleus.Transport" <|-- "nucleus.Restconf"
+"nucleus.Device" <|-- "nucleus.csbiDevice"
+"nucleus.Storable" <|-- "nucleus.csbiDevice"
 "nucleus.PrincipalNetworkDomain" <|-- "nucleus.pndImplementation"
 "nucleus.Storable" <|-- "nucleus.pndImplementation"
+"nucleus.Store" <|-- "nucleus.store"
 
-"__builtin__.int" #.. "nucleus.Operation"
-"__builtin__.string" #.. "nucleus.CtxKeyType"
 "nucleus.fontcolorbluemapfontuuidUUIDStorable" #.. "nucleus.store"
 @enduml
 ```