diff --git a/testdata/umldoc-ref/allclasses-frame.html b/testdata/umldoc-ref/allclasses-frame.html
index c69daef..2bc5f0a 100644
--- a/testdata/umldoc-ref/allclasses-frame.html
+++ b/testdata/umldoc-ref/allclasses-frame.html
@@ -2,7 +2,7 @@
-
+
All Classes
diff --git a/testdata/umldoc-ref/allclasses-noframe.html b/testdata/umldoc-ref/allclasses-noframe.html
index 162c967..86e22a2 100644
--- a/testdata/umldoc-ref/allclasses-noframe.html
+++ b/testdata/umldoc-ref/allclasses-noframe.html
@@ -2,7 +2,7 @@
-
+
All Classes
diff --git a/testdata/umldoc-ref/constant-values.html b/testdata/umldoc-ref/constant-values.html
index 0764c4f..f0d817b 100644
--- a/testdata/umldoc-ref/constant-values.html
+++ b/testdata/umldoc-ref/constant-values.html
@@ -2,7 +2,7 @@
-
+
Constant Field Values
diff --git a/testdata/umldoc-ref/deprecated-list.html b/testdata/umldoc-ref/deprecated-list.html
index 6cf349b..16228de 100644
--- a/testdata/umldoc-ref/deprecated-list.html
+++ b/testdata/umldoc-ref/deprecated-list.html
@@ -2,7 +2,7 @@
-
+
Deprecated List
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/Customer.dot b/testdata/umldoc-ref/gr/spinellis/invoice/Customer.dot
index d20940f..bf9ae75 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/Customer.dot
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/Customer.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/Customer.html b/testdata/umldoc-ref/gr/spinellis/invoice/Customer.html
index 35312bc..2351444 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/Customer.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/Customer.html
@@ -2,7 +2,7 @@
-
+
Customer
@@ -95,6 +95,7 @@ Class Customer
+
java.lang.Object
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.dot b/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.dot
index 850d66b..01428bd 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.dot
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.html b/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.html
index 9400e46..3d74fd6 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/Invoice.html
@@ -2,7 +2,7 @@
-
+
Invoice
@@ -97,6 +97,7 @@ Class Invoice
+
java.lang.Object
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.dot b/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.dot
index f7e2d4c..6d1f66a 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.dot
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.html b/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.html
index c0e57ac..e990b26 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/InvoiceItem.html
@@ -2,7 +2,7 @@
-
+
InvoiceItem
@@ -95,6 +95,7 @@ Class InvoiceItem
+
java.lang.Object
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/gr.spinellis.invoice.dot b/testdata/umldoc-ref/gr/spinellis/invoice/gr.spinellis.invoice.dot
index 685a77d..a358e03 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/gr.spinellis.invoice.dot
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/gr.spinellis.invoice.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/package-frame.html b/testdata/umldoc-ref/gr/spinellis/invoice/package-frame.html
index 3145a30..d9b4d18 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/package-frame.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/package-frame.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.invoice
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/package-summary.html b/testdata/umldoc-ref/gr/spinellis/invoice/package-summary.html
index 03c7440..ccd27a7 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/package-summary.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/package-summary.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.invoice
@@ -86,6 +86,7 @@ Package gr.spinellis.invoice
+
diff --git a/testdata/umldoc-ref/gr/spinellis/invoice/package-tree.html b/testdata/umldoc-ref/gr/spinellis/invoice/package-tree.html
index 0048957..6b8260a 100644
--- a/testdata/umldoc-ref/gr/spinellis/invoice/package-tree.html
+++ b/testdata/umldoc-ref/gr/spinellis/invoice/package-tree.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.invoice Class Hierarchy
diff --git a/testdata/umldoc-ref/gr/spinellis/product/Category.dot b/testdata/umldoc-ref/gr/spinellis/product/Category.dot
index 48b4864..c2b0708 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/Category.dot
+++ b/testdata/umldoc-ref/gr/spinellis/product/Category.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/product/Category.html b/testdata/umldoc-ref/gr/spinellis/product/Category.html
index 81d4bed..ea5e158 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/Category.html
+++ b/testdata/umldoc-ref/gr/spinellis/product/Category.html
@@ -2,7 +2,7 @@
-
+
Category
@@ -95,6 +95,7 @@ Class Category
+
java.lang.Object
diff --git a/testdata/umldoc-ref/gr/spinellis/product/Product.dot b/testdata/umldoc-ref/gr/spinellis/product/Product.dot
index 9a51f3d..49cc978 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/Product.dot
+++ b/testdata/umldoc-ref/gr/spinellis/product/Product.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/product/Product.html b/testdata/umldoc-ref/gr/spinellis/product/Product.html
index 802e23a..a058287 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/Product.html
+++ b/testdata/umldoc-ref/gr/spinellis/product/Product.html
@@ -2,7 +2,7 @@
-
+
Product
@@ -97,6 +97,7 @@ Class Product
+
java.lang.Object
diff --git a/testdata/umldoc-ref/gr/spinellis/product/gr.spinellis.product.dot b/testdata/umldoc-ref/gr/spinellis/product/gr.spinellis.product.dot
index 0d448da..96d934d 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/gr.spinellis.product.dot
+++ b/testdata/umldoc-ref/gr/spinellis/product/gr.spinellis.product.dot
@@ -1,7 +1,7 @@
#!/usr/local/bin/dot
#
# Class diagram
-# Generated by UmlGraph version 5.0 (http://www.spinellis.gr/sw/umlgraph)
+# Generated by UMLGraph version 5.1 (http://www.umlgraph.org/)
#
digraph G {
diff --git a/testdata/umldoc-ref/gr/spinellis/product/package-frame.html b/testdata/umldoc-ref/gr/spinellis/product/package-frame.html
index ced48e3..b7b4eb4 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/package-frame.html
+++ b/testdata/umldoc-ref/gr/spinellis/product/package-frame.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.product
diff --git a/testdata/umldoc-ref/gr/spinellis/product/package-summary.html b/testdata/umldoc-ref/gr/spinellis/product/package-summary.html
index fd5f10c..f77c9d2 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/package-summary.html
+++ b/testdata/umldoc-ref/gr/spinellis/product/package-summary.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.product
@@ -85,6 +85,7 @@ Package gr.spinellis.product
+
diff --git a/testdata/umldoc-ref/gr/spinellis/product/package-tree.html b/testdata/umldoc-ref/gr/spinellis/product/package-tree.html
index dcd02d8..3236205 100644
--- a/testdata/umldoc-ref/gr/spinellis/product/package-tree.html
+++ b/testdata/umldoc-ref/gr/spinellis/product/package-tree.html
@@ -2,7 +2,7 @@
-
+
gr.spinellis.product Class Hierarchy
diff --git a/testdata/umldoc-ref/help-doc.html b/testdata/umldoc-ref/help-doc.html
index 23f74dd..4452bc3 100644
--- a/testdata/umldoc-ref/help-doc.html
+++ b/testdata/umldoc-ref/help-doc.html
@@ -2,7 +2,7 @@
-
+
API Help
diff --git a/testdata/umldoc-ref/index-all.html b/testdata/umldoc-ref/index-all.html
index 177678d..7c68aac 100644
--- a/testdata/umldoc-ref/index-all.html
+++ b/testdata/umldoc-ref/index-all.html
@@ -2,7 +2,7 @@
-
+
Index
diff --git a/testdata/umldoc-ref/index.html b/testdata/umldoc-ref/index.html
index b5f8f77..25961ea 100644
--- a/testdata/umldoc-ref/index.html
+++ b/testdata/umldoc-ref/index.html
@@ -2,7 +2,7 @@
-
+
Generated Documentation (Untitled)
diff --git a/testdata/umldoc-ref/overview-frame.html b/testdata/umldoc-ref/overview-frame.html
index 0381f8b..634da4c 100644
--- a/testdata/umldoc-ref/overview-frame.html
+++ b/testdata/umldoc-ref/overview-frame.html
@@ -2,7 +2,7 @@
-
+
Overview List
diff --git a/testdata/umldoc-ref/overview-summary.html b/testdata/umldoc-ref/overview-summary.html
index 5801567..de16449 100644
--- a/testdata/umldoc-ref/overview-summary.html
+++ b/testdata/umldoc-ref/overview-summary.html
@@ -2,7 +2,7 @@
-
+
Overview
diff --git a/testdata/umldoc-ref/overview-tree.html b/testdata/umldoc-ref/overview-tree.html
index 8801b76..e7d3ece 100644
--- a/testdata/umldoc-ref/overview-tree.html
+++ b/testdata/umldoc-ref/overview-tree.html
@@ -2,7 +2,7 @@
-
+
Class Hierarchy
