Nucleus/Principal-Network-Domain.md

+The `pndImplementation` implements the `PrincipalNetworkDomain` interface. A `Principal Network Domain (PND)` is the main data structure within the `Nucleus`. It holds the Orchestrated Network Devices, as well as the supported Southbound Interfaces in its domain.
+
 ```plantuml
 interface PrincipalNetworkDomain  {
         + Destroy() error
-        + AddSbi() error
-        + RemoveSbi() error
-        + AddDevice() error
-        + RemoveDevice() error
-
+        + AddSbi( <font color=blue>interface</font>{}) error
+        + RemoveSbi( uuid.UUID) error
+        + AddDevice( <font color=blue>interface</font>{}) error
+        + RemoveDevice( uuid.UUID) error
+        + Request( uuid.UUID,  string) error
+        + RequestAll( string) error
+        + GetName() string
+        + GetDescription() string
+        + MarshalDevice( uuid.UUID) (string, error)
+        + ContainsDevice( uuid.UUID) bool
+        + GetSBIs() <font color=blue>interface</font>{}
+        + ID() uuid.UUID
     }
-```
 
-```plantuml
 class pndImplementation << (S,Aquamarine) >> {
         - name string
-        - sbiContainer map[string]nucleus.SouthboundInterface
-        - devices map[uuid]Device
+        - description string
+        - sbic sbiStore
+        - devices deviceStore
+        - id uuid.UUID
 
-        + Destroy() error
-        + AddSbi() error
-        + RemoveSbi() error
+        - addSbi(sbi SouthboundInterface) error
+        - removeSbi(id uuid.UUID) error
+        - addDevice(device *Device) error
+        - getDevice(id uuid.UUID) (*Device, error)
+        - removeDevice(id uuid.UUID) error
 
+        + ID() uuid.UUID
+        + GetName() string
+        + ContainsDevice(id uuid.UUID) bool
+        + GetDescription() string
+        + GetSBIs() <font color=blue>interface</font>{}
+        + Destroy() error
+        + AddSbi(sbi <font color=blue>interface</font>{}) error
+        + RemoveSbi(id uuid.UUID) error
+        + AddDevice(device <font color=blue>interface</font>{}) error
+        + RemoveDevice(uuid uuid.UUID) error
+        + MarshalDevice(uuid uuid.UUID) (string, error)
+        + Request(uuid uuid.UUID, path string) error
+        + RequestAll(path string) error
+        + Set(uuid uuid.UUID, path string, value string) (<font color=blue>interface</font>{}, error)
     }
+
+"PrincipalNetworkDomain" <|-- "pndImplementation"
 ```
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