diff --git a/src/conf.py b/src/conf.py
index 306feec..8b02b35 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -133,6 +133,18 @@ class AppSettings(BaseSettings):
 app_settings = AppSettings()
 
 
+class XslFile(BaseModel):
+    id: tuple
+    bez: str
+    xsl_file: Path
+    
+
+class TreeNode(BaseModel):
+    id: tuple
+    bez: str
+    children: set["TreeNode|XslFile"]
+
+
 class PdfProjectSettings(BaseSettings):
     """
     Speichert Projekt-Einstellungen direkt im Ordner des Projekts in einer Klartextdatei JSON