diff --git a/doc/devel/UML/iso_tree.violet b/doc/devel/UML/iso_tree.violet
index e0a7e0e..feef2c7 100644
--- a/doc/devel/UML/iso_tree.violet
+++ b/doc/devel/UML/iso_tree.violet
@@ -5,8 +5,7 @@
    <object id="ClassNode0" class="com.horstmann.violet.ClassNode"> 
     <void property="attributes"> 
      <void property="text"> 
-      <string>path : char *
-size : off_t</string> 
+      <string>size : off_t</string> 
      </void> 
     </void> 
     <void property="name"> 
@@ -17,8 +16,8 @@ size : off_t</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>136.78812183065844</double> 
-     <double>285.84407602094683</double> 
+     <double>185.9954940382799</double> 
+     <double>488.5066209425904</double> 
     </void> 
    </object> 
   </void> 
@@ -44,8 +43,8 @@ biblio_file_id : char*</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>846.3823937606093</double> 
-     <double>129.32909259072375</double> 
+     <double>830.9681801982362</double> 
+     <double>182.66718770734806</double> 
     </void> 
    </object> 
   </void> 
@@ -64,8 +63,8 @@ biblio_file_id : char*</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>343.8940609153292</double> 
-     <double>178.78347904495376</double> 
+     <double>342.4798473529561</double> 
+     <double>272.1215741615781</double> 
     </void> 
    </object> 
   </void> 
@@ -85,13 +84,20 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>467.8940609153292</double> 
-     <double>31.783479044953765</double> 
+     <double>466.4798473529561</double> 
+     <double>125.12157416157802</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
    <object id="ClassNode4" class="com.horstmann.violet.ClassNode"> 
+    <void property="methods"> 
+     <void property="text"> 
+      <string>add(XXX)
+remove(Node)
+children()</string> 
+     </void> 
+    </void> 
     <void property="name"> 
      <void property="text"> 
       <string>Directory</string> 
@@ -100,8 +106,8 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>644.8940609153292</double> 
-     <double>176.78347904495376</double> 
+     <double>643.4798473529561</double> 
+     <double>270.1215741615781</double> 
     </void> 
    </object> 
   </void> 
@@ -120,8 +126,8 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>466.8940609153292</double> 
-     <double>178.78347904495376</double> 
+     <double>465.4798473529561</double> 
+     <double>272.1215741615781</double> 
     </void> 
    </object> 
   </void> 
@@ -140,18 +146,13 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>531.1984926864122</double> 
-     <double>292.2764546759387</double> 
+     <double>403.78427912403913</double> 
+     <double>384.61454979256314</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
    <object id="ClassNode7" class="com.horstmann.violet.ClassNode"> 
-    <void property="attributes"> 
-     <void property="text"> 
-      <string>path: char*</string> 
-     </void> 
-    </void> 
     <void property="name"> 
      <void property="text"> 
       <string>FilteredFile</string> 
@@ -160,8 +161,8 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>385.41302387615644</double> 
-     <double>286.6548689059442</double> 
+     <double>326.99881031378334</double> 
+     <double>487.9929640225687</double> 
     </void> 
    </object> 
   </void> 
@@ -180,8 +181,8 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>260.0059692959062</double> 
-     <double>286.89804044593336</double> 
+     <double>258.5917557335331</double> 
+     <double>380.2361355625578</double> 
     </void> 
    </object> 
   </void> 
@@ -195,8 +196,8 @@ attribs : struct stat</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>98.00271893906279</double> 
-     <double>179.28361365806154</double> 
+     <double>217.58850537668968</double> 
+     <double>273.6217087746859</double> 
     </void> 
    </object> 
   </void> 
@@ -218,8 +219,8 @@ Filter</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>380.0</double> 
-     <double>420.0</double> 
+     <double>520.0</double> 
+     <double>450.0</double> 
     </void> 
    </object> 
   </void> 
@@ -227,8 +228,8 @@ Filter</string>
    <object idref="InterfaceNode0"/> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>387.0</double> 
-     <double>454.0</double> 
+     <double>534.5857864376269</double> 
+     <double>482.33809511662446</double> 
     </void> 
    </object> 
   </void> 
@@ -245,8 +246,158 @@ a File attribute</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>11.0</double> 
-     <double>419.0</double> 
+     <double>144.5857864376269</double> 
+     <double>578.3380951166248</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode10" class="com.horstmann.violet.ClassNode"> 
+    <void property="attributes"> 
+     <void property="text"> 
+      <string>name : char*</string> 
+     </void> 
+    </void> 
+    <void property="methods"> 
+     <void property="text"> 
+      <string>&lt;&lt;static&gt;&gt;new(id)
+&lt;&lt;static&gt;&gt;read(src, opts)
+create()
+grow()</string> 
+     </void> 
+    </void> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>Image</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>829.5857864376269</double> 
+     <double>417.33809511662446</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="InterfaceNode1" class="com.horstmann.violet.InterfaceNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>«interface»
+DataSource</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>855.5857864376269</double> 
+     <double>573.3380951166248</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="NoteNode1" class="com.horstmann.violet.NoteNode"> 
+    <void property="text"> 
+     <void property="text"> 
+      <string>In addition to the dest as a path, it could
+be a good idea to have a ref to tree node.
+That way we can compute the dest on creation
+time, and thus links to files on image are also valid
+after moving or renaming those files</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>116.5857864376269</double> 
+     <double>121.33809511662426</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="NoteNode2" class="com.horstmann.violet.NoteNode"> 
+    <void property="text"> 
+     <void property="text"> 
+      <string>Image is a context for the creation of images. Its &quot;static&quot;
+methods, new() and read() are used to create a new
+image context, either from scratch or from an existing
+image (for example, a ms disc). The methods create() and
+grow() return an BurnSource suitable for libburn. 
+create() writes a full image, grow() only add to the image
+the new files, thus it is suitable for a new session
+</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>988.5857864376269</double> 
+     <double>547.3380951166246</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode11" class="com.horstmann.violet.ClassNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>Ecma119Source</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>1119.5058052462327</double> 
+     <double>436.9433938860118</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object class="com.horstmann.violet.PackageNode"> 
+    <void method="addChild"> 
+     <object id="InterfaceNode2" class="com.horstmann.violet.InterfaceNode"> 
+      <void property="name"> 
+       <void property="text"> 
+        <string>«interface»
+BurnSource</string> 
+       </void> 
+      </void> 
+     </object> 
+    </void> 
+    <void property="name"> 
+     <string>Libburn</string> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>1120.0</double> 
+     <double>270.0</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object idref="InterfaceNode2"/> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>1131.6773781214863</double> 
+     <double>304.28653963651914</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object class="com.horstmann.violet.NoteNode"> 
+    <void property="text"> 
+     <void property="text"> 
+      <string>Class diagram for the public tree. Note that getters and setters are not shown,
+to improve readability. Note also that not all the attributes will have public getters
+or/and setters.
+El-Torito related information is shown in another diagram.</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>458.2051942088828</double> 
+     <double>28.284271247461895</double> 
     </void> 
    </object> 
   </void> 
@@ -304,18 +455,6 @@ a File attribute</string>
    <object idref="ClassNode4"/> 
    <object idref="ClassNode3"/> 
   </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
-    <void property="bentStyle"> 
-     <object class="com.horstmann.violet.BentStyle" field="VHV"/> 
-    </void> 
-    <void property="endArrowHead"> 
-     <object class="com.horstmann.violet.ArrowHead" field="TRIANGLE"/> 
-    </void> 
-   </object> 
-   <object idref="ClassNode0"/> 
-   <object idref="ClassNode2"/> 
-  </void> 
   <void method="connect"> 
    <object class="com.horstmann.violet.ClassRelationshipEdge"> 
     <void property="bentStyle"> 
@@ -330,6 +469,9 @@ a File attribute</string>
   </void> 
   <void method="connect"> 
    <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="HVH"/> 
+    </void> 
     <void property="endArrowHead"> 
      <object class="com.horstmann.violet.ArrowHead" field="V"/> 
     </void> 
@@ -355,18 +497,6 @@ a File attribute</string>
    <object idref="ClassNode8"/> 
    <object idref="ClassNode2"/> 
   </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
-    <void property="bentStyle"> 
-     <object class="com.horstmann.violet.BentStyle" field="VHV"/> 
-    </void> 
-    <void property="endArrowHead"> 
-     <object class="com.horstmann.violet.ArrowHead" field="TRIANGLE"/> 
-    </void> 
-   </object> 
-   <object idref="ClassNode7"/> 
-   <object idref="ClassNode2"/> 
-  </void> 
   <void method="connect"> 
    <object class="com.horstmann.violet.ClassRelationshipEdge"> 
     <void property="bentStyle"> 
@@ -416,5 +546,117 @@ a File attribute</string>
    <object idref="ClassNode7"/> 
    <object idref="NoteNode0"/> 
   </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="VHV"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="TRIANGLE"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode0"/> 
+   <object idref="ClassNode8"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="VHV"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="TRIANGLE"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode7"/> 
+   <object idref="ClassNode8"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="HVH"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
+    </void> 
+    <void property="endLabel"> 
+     <string>1 volume</string> 
+    </void> 
+    <void property="startArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="BLACK_DIAMOND"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode10"/> 
+   <object idref="ClassNode1"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="HVH"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
+    </void> 
+    <void property="endLabel"> 
+     <string>0..1 src</string> 
+    </void> 
+   </object> 
+   <object idref="ClassNode10"/> 
+   <object idref="InterfaceNode1"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="HVH"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
+    </void> 
+    <void property="lineStyle"> 
+     <object class="com.horstmann.violet.LineStyle" field="DOTTED"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode6"/> 
+   <object idref="InterfaceNode1"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.NoteEdge"/> 
+   <object idref="ClassNode5"/> 
+   <object idref="NoteNode1"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.NoteEdge"/> 
+   <object idref="ClassNode10"/> 
+   <object idref="NoteNode2"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="VHV"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="TRIANGLE"/> 
+    </void> 
+    <void property="lineStyle"> 
+     <object class="com.horstmann.violet.LineStyle" field="DOTTED"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode11"/> 
+   <object idref="InterfaceNode2"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
+    </void> 
+    <void property="lineStyle"> 
+     <object class="com.horstmann.violet.LineStyle" field="DOTTED"/> 
+    </void> 
+    <void property="middleLabel"> 
+     <string>{create}</string> 
+    </void> 
+   </object> 
+   <object idref="ClassNode10"/> 
+   <object idref="ClassNode11"/> 
+  </void> 
  </object> 
 </java> 
diff --git a/doc/devel/UML/nglibisofs.violet b/doc/devel/UML/nglibisofs.violet
index cabfed6..400643d 100644
--- a/doc/devel/UML/nglibisofs.violet
+++ b/doc/devel/UML/nglibisofs.violet
@@ -280,8 +280,8 @@ BurnSource</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>1335.0915916838596</double> 
-     <double>396.94844451989485</double> 
+     <double>1346.0915916838594</double> 
+     <double>425.9484445198948</double> 
     </void> 
    </object> 
   </void> 
@@ -341,8 +341,8 @@ BurnSource</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>1330.0</double> 
-     <double>370.0</double> 
+     <double>1340.0</double> 
+     <double>400.0</double> 
     </void> 
    </object> 
   </void> 
@@ -356,8 +356,8 @@ BurnSource</string>
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>1096.4640655004926</double> 
-     <double>544.6103494032706</double> 
+     <double>1095.4640655004926</double> 
+     <double>540.6103494032706</double> 
     </void> 
    </object> 
   </void>