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doc/schema.md

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+# Architecture UPnP/DLNA
+
+Voici la séparation **définition** vs **runtime** :
+
+```mermaid
+classDiagram
+  class Device
+  class Service
+  class Action
+  class StateVariable
+
+  class Server
+  class DeviceInstance
+  class ServiceInstance
+  class StateVariableInstance
+  class ActionHandler
+
+  Device "1" --> "1..*" Service
+  Device "0..*" --> "0..*" Device
+  Service "0..*" --> "0..*" Action
+  Service "1..*" --> "1..*" StateVariable
+
+  Server "1" --> "1..*" DeviceInstance
+  DeviceInstance "1" --> "1..*" ServiceInstance
+  DeviceInstance "0..*" --> "0..*" DeviceInstance
+  ServiceInstance "1" --> "1..*" StateVariableInstance
+  ServiceInstance "0..*" --> "0..*" ActionHandler
+
+  DeviceInstance ..> Device : instantiates
+  ServiceInstance ..> Service : instantiates
+  StateVariableInstance ..> StateVariable : instantiates
+  ActionHandler ..> Action : handles
+
+  class Device:::deviceType
+  class Service:::deviceType
+  class Action:::deviceType
+  class StateVariable:::deviceType
+
+  class Server:::instanceType
+  class DeviceInstance:::instanceType
+  class ServiceInstance:::instanceType
+  class StateVariableInstance:::instanceType
+  class ActionHandler:::instanceType
+
+  classDef deviceType fill:#f9f,stroke:#333,stroke-width:1px;
+  classDef instanceType fill:#9f9,stroke:#333,stroke-width:1px;
+```
+