diff --git a/schema/klighd/actions/setSyntheses.json b/schema/klighd/actions/setSyntheses.json
index 79398e2e..021faf00 100644
--- a/schema/klighd/actions/setSyntheses.json
+++ b/schema/klighd/actions/setSyntheses.json
@@ -3,7 +3,7 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "title": "setSyntheses",
     "type": "object",
-    "allOf": [{"$ref": "../../sprotty/messages/diagramAccept.json#/definitions/action"}],
+    "allOf": [{"$ref": "/kieler/klighd-vscode/tree/main/schema/sprotty/action.json"}],
     "properties": {
         "kind": {
             "type": "string",
diff --git a/schema/klighd/actions/updateOptions.json b/schema/klighd/actions/updateOptions.json
index 4294ed71..3a2b6f39 100644
--- a/schema/klighd/actions/updateOptions.json
+++ b/schema/klighd/actions/updateOptions.json
@@ -3,7 +3,7 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "title": "updateOptions",
     "type": "object",
-    "allOf": [{"$ref": "../../sprotty/messsages/diagramAccept.json#/definitions/action"}],
+    "allOf": [{"$ref": "/kieler/klighd-vscode/tree/main/schema/sprotty/action.json"}],
     "properties": {
         "kind": {
             "type": "string",
@@ -12,7 +12,7 @@
         "valuedSynthesisOptions": {
             "type": "array",
             "items": {
-                "$ref": "#/definitions/SynthesisOption"
+                "$ref": "#/definitions/ValuedSynthesisOption"
             }
         },
         "layoutOptions": {
@@ -26,7 +26,7 @@
         }
     },
     "definitions": {
-        "SynthesisOption": {
+        "ValuedSynthesisOption": {
             "type": "object",
             "properties": {
                 "synthesisOption": {
@@ -35,7 +35,8 @@
                         {"$ref": "#/definitions/choiceSynthesisOption"},
                         {"$ref": "#/definitions/rangeSynthesisOption"},
                         {"$ref": "#/definitions/textSynthesisOption"},
-                        {"$ref": "#/definitions/separatorSynthesisOption"}
+                        {"$ref": "#/definitions/separatorSynthesisOption"},
+                        {"$ref": "#/definitions/categorySynthesisOption"}
                     ]
                 },
                 "currentValue": {
@@ -43,7 +44,7 @@
                 }
             }
         },
-        "generalSynthesisOption": {
+        "SynthesisOption": {
             "type": "object",
             "properties": {
                         
@@ -60,7 +61,7 @@
                     "type": "string"
                 },
                 "category": {
-                    "$ref": "#/definitions/SynthesisCategory"
+                    "$ref": "#/definitions/categorySynthesisOption"
                 },
                 "sourceHash": {
                     "type": "string"
@@ -69,7 +70,7 @@
             }
         },
         "checkSynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
@@ -81,7 +82,7 @@
             }
         },
         "choiceSynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
@@ -99,7 +100,7 @@
             }
         },
         "rangeSynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
@@ -125,7 +126,7 @@
             }
         },
         "textSynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
@@ -137,7 +138,7 @@
             }
         },
         "separatorSynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
@@ -146,11 +147,14 @@
             }
         },
         "categorySynthesisOption": {
-            "allOf": [{"$ref": "#/definitions/generalSynthesisOption"}],
+            "allOf": [{"$ref": "#/definitions/SynthesisOption"}],
             "properties": {
                 "type": {
                     "type": "number",
                     "enum": [5]
+                },
+                "initialValue": {
+                    "type": "boolean"
                 }
             }
         }
diff --git a/schema/sprotty/actions/action.json b/schema/sprotty/actions/action.json
new file mode 100644
index 00000000..48f6c51b
--- /dev/null
+++ b/schema/sprotty/actions/action.json
@@ -0,0 +1,11 @@
+{
+    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/actions/action.json",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "action",
+    "type": "object",
+    "properties": {
+        "kind": {
+            "type": "string"
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/sprotty/actions/requestBounds.json b/schema/sprotty/actions/requestBounds.json
index d65e8c52..8eb97ad9 100644
--- a/schema/sprotty/actions/requestBounds.json
+++ b/schema/sprotty/actions/requestBounds.json
@@ -1,9 +1,9 @@
 {
-    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/messages/requestBounds.json",
+    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/actions/requestBounds.json",
     "$schema": "http://json-schema.org/draft-07/schema#",
     "title": "requestBounds",
     "type": "object",
-    "allOf": [{"$ref": "../../sprotty/messages/diagramAccept.json#/definitions/action"}],
+    "allOf": [{"$ref": "/kieler/klighd-vscode/tree/main/schema/sprotty/actions/action.json"}],
     "properties": {
         "kind": {
             "type": "string",
@@ -25,7 +25,7 @@
                 "children": {
                     "type": "array",
                     "items": {
-                        "$ref": "../../klighd/SKGraphSchema#/definitions/SKGraph"
+                        "$ref": "/kieler/klighd-vscode/tree/main/schema/klighd/SKGraphSchema#/definitions/SKGraph"
                     }
                 }
             }
diff --git a/schema/sprotty/actions/requestModel.json b/schema/sprotty/actions/requestModel.json
new file mode 100644
index 00000000..f9e1564f
--- /dev/null
+++ b/schema/sprotty/actions/requestModel.json
@@ -0,0 +1,34 @@
+{
+    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/actions/requestModel.json",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "requestBounds",
+    "type": "object",
+    "allOf": [{"$ref": "/kieler/klighd-vscode/tree/main/schema/sprotty/actions/action.json"}],
+        "properties": {
+            "kind": {
+                "type": "string",
+                "enum": ["requestModel"]
+            },
+            "options": {
+                "type": "object",
+                "properties": {
+                    "needsClientLayout": {
+                        "type": "boolean"
+                    },
+                    "needsServerLayout": {
+                        "type": "boolean"
+                    },
+                    "sourceUri": {
+                        "type": "string"
+                    },
+                    "diagramType": {
+                        "type": "string",
+                        "enum": ["keith-diagram"]
+                    }
+                }
+            },
+            "requestId": {
+                "type": "string"
+            }
+        }
+}
\ No newline at end of file
diff --git a/schema/sprotty/diagramAccept.json b/schema/sprotty/diagramAccept.json
new file mode 100644
index 00000000..22a7b106
--- /dev/null
+++ b/schema/sprotty/diagramAccept.json
@@ -0,0 +1,27 @@
+{
+    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/messages/diagramAccept.json",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "diagram/accept",
+    "type": "object",
+    "properties": {
+        "jsonrpc": {
+            "type": "string"
+        },
+        "method": {
+            "type": "string",
+            "enum": ["diagram/accept"]
+        },
+        "params": {
+            "type": "object",
+            "properties": {
+                "clientId": {
+                    "type": "string",
+                    "enum": ["sprotty"]
+                },
+                "action": {
+                    "$ref": "./actions/action.json#action"
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/sprotty/messages/diagramAccept.json b/schema/sprotty/messages/diagramAccept.json
deleted file mode 100644
index b8fb5b86..00000000
--- a/schema/sprotty/messages/diagramAccept.json
+++ /dev/null
@@ -1,67 +0,0 @@
-{
-    "$id": "https://github.com/kieler/klighd-vscode/tree/main/schema/sprotty/messages/diagramAccept.json",
-    "$schema": "http://json-schema.org/draft-07/schema#",
-    "title": "diagram/accept",
-    "type": "object",
-    "properties": {
-        "jsonrpc": {
-            "type": "string"
-        },
-        "method": {
-            "type": "string",
-            "enum": ["diagram/accept"]
-        },
-        "params": {
-            "type": "object",
-            "properties": {
-                "clientId": {
-                    "type": "string",
-                    "enum": ["sprotty"]
-                },
-                "action": {
-                    "$ref": "#/definitions/action"
-                }
-            }
-        }
-    },
-    "definitions": {
-        "action": {
-            "type": "object",
-            "properties": {
-                "kind": {
-                    "type": "string"
-                }
-            }
-        },
-        "requestModelAction": {
-            "allOf": [{"$ref": "#/definitions/action"}],
-            "properties": {
-                "kind": {
-                    "type": "string",
-                    "enum": ["requestModel"]
-                },
-                "options": {
-                    "type": "object",
-                    "properties": {
-                        "needsClientLayout": {
-                            "type": "boolean"
-                        },
-                        "needsServerLayout": {
-                            "type": "boolean"
-                        },
-                        "sourceUri": {
-                            "type": "string"
-                        },
-                        "diagramType": {
-                            "type": "string",
-                            "enum": ["keith-diagram"]
-                        }
-                    }
-                },
-                "requestId": {
-                    "type": "string"
-                }
-            }
-        }
-    }
-}
\ No newline at end of file