diff --git a/testdata/dot-ref/ViewAtt.dot b/testdata/dot-ref/ViewAtt.dot
index 31ced18..89ff32b 100644
--- a/testdata/dot-ref/ViewAtt.dot
+++ b/testdata/dot-ref/ViewAtt.dot
@@ -7,16 +7,18 @@
 digraph G {
 	edge [fontname="Helvetica",fontsize=10,labelfontname="Helvetica",labelfontsize=10];
 	node [fontname="Helvetica",fontsize=10,shape=plaintext];
+	nodesep=0.25;
+	ranksep=0.5;
 	// gr.spinellis.basic.invoice.InvoiceItem
-	c279 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> InvoiceItem </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  product </td></tr><tr><td align="left" balign="left">  quantity </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
+	c279 [label=<<table title="gr.spinellis.basic.invoice.InvoiceItem" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> InvoiceItem </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  product </td></tr><tr><td align="left" balign="left">  quantity </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
 	// gr.spinellis.basic.invoice.Invoice
-	c280 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Invoice </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  total </td></tr><tr><td align="left" balign="left">  items </td></tr><tr><td align="left" balign="left">  customer </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
+	c280 [label=<<table title="gr.spinellis.basic.invoice.Invoice" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Invoice </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  total </td></tr><tr><td align="left" balign="left">  items </td></tr><tr><td align="left" balign="left">  customer </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
 	// gr.spinellis.basic.invoice.Customer
-	c281 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Customer </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
+	c281 [label=<<table title="gr.spinellis.basic.invoice.Customer" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Customer </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
 	// gr.spinellis.basic.product.Product
-	c282 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Product </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr><tr><td align="left" balign="left">  stock </td></tr><tr><td align="left" balign="left">  price </td></tr><tr><td align="left" balign="left">  category </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
+	c282 [label=<<table title="gr.spinellis.basic.product.Product" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Product </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr><tr><td align="left" balign="left">  stock </td></tr><tr><td align="left" balign="left">  price </td></tr><tr><td align="left" balign="left">  category </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
 	// gr.spinellis.basic.product.Category
-	c283 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Category </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr><tr><td align="left" balign="left">  products </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
+	c283 [label=<<table title="gr.spinellis.basic.product.Category" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="yellow"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> Category </td></tr></table></td></tr><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="left" balign="left">  name </td></tr><tr><td align="left" balign="left">  products </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=16.0];
 	// gr.spinellis.basic.invoice.InvoiceItem ASSOC gr.spinellis.basic.product.Product
 	c279:p -> c282:p [taillabel="*", label="", headlabel="1", fontname="Helvetica", fontcolor="black", fontsize=10.0, color="black", arrowhead=none];
 	// gr.spinellis.basic.invoice.Invoice ASSOC gr.spinellis.basic.invoice.Customer