diff --git a/doc/model.puml b/doc/model.puml
index 6bdcb20..e75a8c1 100644
--- a/doc/model.puml
+++ b/doc/model.puml
@@ -3,6 +3,11 @@
 
 abstract Ressource {
     +id: int
+    +name: string
+    +icon: string
+    +description: string
+    +graphic: GraphicElement
+    +element: Data/Processing/Storage/Workflow/Datacenter
 }
 
 class Data {
@@ -15,7 +20,7 @@ class Processing {
     +name: string
     +container: string
     +command: int
-    +environment: int
+    +environment: int   
 
 }
 
@@ -52,14 +57,28 @@ class WorkflowSchedule {
 
 class Graph {
     +id: int
-    Ressource[] ressources
-    Link[] links
+    +ressources: Ressource[] 
+    +links: Link[] 
 }
 
 class Link {
     +id: int
     +source: Ressource
     +target: Ressource
+    graphic: GraphicLink
+}
+
+class GraphicLink {
+    +id: int
+    +startXY: coord
+    +endXY: coord
+    +style: string
+}   
+
+class GraphicElement {
+    +id: int
+    +style: string
+    +xy: coord
 }
 
 class Calendar {
@@ -81,6 +100,14 @@ class DatacenterWorkflows {
     +workflows: Workflow[]
 }   
 
+class Graph {
+    +id: int
+    +graph: Graph
+    +workflows: Workflow[]
+}
+
+
+
 UserWorkflows "1" o-- "0..*" Workflow
 
 DatacenterWorkflows "1" o-- "0..*" Workflow
@@ -100,6 +127,9 @@ Workflow "1" o-- "0..*" Graph
 Graph "1" o-- "0..*" Ressource
 Graph "1" o-- "0..*" Link
 
+Ressource -- GraphicElement
+Link -- GraphicLink
+
 
 Calendar "1" o-- "0..*" Workflow