--- a/application/demo_bindings.h	Tue Nov 18 17:26:15 2025 +0100
+++ b/application/demo_bindings.h	Tue Nov 18 18:54:53 2025 +0100
@@ -32,9 +32,22 @@
     UiList *doclist;
 } MainWindow;
 
+typedef struct SubDocument SubDocument;
+
 typedef struct Document {
     UiString *id;
     UiString *name;
     
     UiString *input_name;
+    
+    UiList *subdocuments;
+    SubDocument *current_sub;
 } Document;
+
+struct SubDocument {
+    UiString *id;
+    UiString *name;
+    
+    UiString *input_name;
+};
+