Index: doc/developer/src/data1.dot
===================================================================
--- doc/developer/src/data1.dot	(revision 20856)
+++ doc/developer/src/data1.dot	(revision 20857)
@@ -7,6 +7,8 @@
 	pcb_board_t -> pcb_data_t
 	pcb_board_t [shape=box]
 
+	pcb_data_t2 [label="another level of\npcb_data_t\n..." shape=none]
+
 	pcb_subc_t [shape=box style=filled color="#aaffaa"]
 	pcb_rat_line_t [shape=box style=filled color="#aaffaa"]
 	pcb_pstk_t [shape=box style=filled color="#aaffaa"]
@@ -44,7 +46,7 @@
 	DataType_listrt -> pcb_rat_line_t
 	DataType_listrt -> pcb_pstk_t
 
-	pcb_subc_t -> pcb_data_t [color=blue constraint=0 tailport=s]
+	pcb_subc_t -> pcb_data_t2
 
 	LayerType_lines [label="list and rtree of lines"]
 	LayerType_arcs [label="list and rtree of arcs"]