diff --git a/doc/devel/UML/iso_tree.violet b/doc/devel/UML/iso_tree.violet
index 9448c1b..85c7237 100644
--- a/doc/devel/UML/iso_tree.violet
+++ b/doc/devel/UML/iso_tree.violet
@@ -191,8 +191,8 @@ the new files, thus it is suitable for a new session
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>1234.6589462905451</double> 
-     <double>680.2741699796954</double> 
+     <double>1212.7956394939486</double> 
+     <double>697.0920982847697</double> 
     </void> 
    </object> 
   </void> 
@@ -258,198 +258,12 @@ We don&apos;t show the several functions in Dir to manage the tree.</string>
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
      <double>290.59037712396525</double> 
-     <double>9.859316379054512</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="ClassNode8" class="com.horstmann.violet.ClassNode"> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>FileSourceRegistry</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>663.3494218736668</double> 
-     <double>707.2510088513307</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="NoteNode2" class="com.horstmann.violet.NoteNode"> 
-    <void property="text"> 
-     <void property="text"> 
-      <string>A source that read its data from an arbitrary file
-descritor. size must be know in advance.</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>888.4680374315352</double> 
-     <double>726.8792924010775</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="NoteNode3" class="com.horstmann.violet.NoteNode"> 
-    <void property="text"> 
-     <void property="text"> 
-      <string>The idea of the registry is to keep track
-of sources for the same file (to implement
-cache inodes, for exampe)</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>796.4629867976516</double> 
-     <double>789.9797974644656</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="ClassNode9" class="com.horstmann.violet.ClassNode"> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>TransformSource</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>465.9331463967205</double> 
-     <double>595.4414715712101</double> 
+     <double>9.859316379054544</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
    <object id="InterfaceNode1" class="com.horstmann.violet.InterfaceNode"> 
-    <void property="methods"> 
-     <void property="text"> 
-      <string>get_size()
-read()
-open()
-close()
-is_repeatable()</string> 
-     </void> 
-    </void> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>«interface»
-FileSource</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>685.9331463967205</double> 
-     <double>410.4414715712108</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="NoteNode4" class="com.horstmann.violet.NoteNode"> 
-    <void property="text"> 
-     <void property="text"> 
-      <string>A Filter do a tranformation on a stream of data.
-The main difference with TransformSources is that
-a Filter can be applied to several sources.
-NOTES: 
-- filter() method still to define
-- A filter_changes_size() method can be useful
-</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>350.5947306335493</double> 
-     <double>803.951562474507</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="InterfaceNode2" class="com.horstmann.violet.InterfaceNode"> 
-    <void property="methods"> 
-     <void property="text"> 
-      <string>filter(in, out)</string> 
-     </void> 
-    </void> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>«interface»
-Filter</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>274.0746933916357</double> 
-     <double>694.5765090198104</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="ClassNode10" class="com.horstmann.violet.ClassNode"> 
-    <void property="attributes"> 
-     <void property="text"> 
-      <string>size : off_t
-block : uint32_t</string> 
-     </void> 
-    </void> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>PreviousImageSource</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>976.3688193543292</double> 
-     <double>599.7669830819689</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="ClassNode11" class="com.horstmann.violet.ClassNode"> 
-    <void property="attributes"> 
-     <void property="text"> 
-      <string>path : char*</string> 
-     </void> 
-    </void> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>LocalFileSource</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>674.5900006462128</double> 
-     <double>602.9561901969712</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="ClassNode12" class="com.horstmann.violet.ClassNode"> 
-    <void property="name"> 
-     <void property="text"> 
-      <string>FilterSource</string> 
-     </void> 
-    </void> 
-   </object> 
-   <object class="java.awt.geom.Point2D$Double"> 
-    <void method="setLocation"> 
-     <double>417.08326112068517</double> 
-     <double>711.364573775316</double> 
-    </void> 
-   </object> 
-  </void> 
-  <void method="addNode"> 
-   <object id="InterfaceNode3" class="com.horstmann.violet.InterfaceNode"> 
     <void property="name"> 
      <void property="text"> 
       <string>«interface»
@@ -467,68 +281,148 @@ DataSource</string>
   <void method="addNode"> 
    <object class="com.horstmann.violet.PackageNode"> 
     <void method="addChild"> 
-     <object idref="InterfaceNode2"/> 
+     <object id="InterfaceNode2" class="com.horstmann.violet.InterfaceNode"> 
+      <void property="name"> 
+       <void property="text"> 
+        <string>«interface»
+Filters</string> 
+       </void> 
+      </void> 
+     </object> 
     </void> 
     <void property="name"> 
-     <string>Filters</string> 
+     <string>filters</string> 
     </void> 
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
      <double>260.0</double> 
-     <double>660.0</double> 
+     <double>710.0</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
-   <object id="ClassNode13" class="com.horstmann.violet.ClassNode"> 
+   <object idref="InterfaceNode2"/> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>265.45434264405947</double> 
+     <double>743.9994422711634</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode8" class="com.horstmann.violet.ClassNode"> 
     <void property="name"> 
      <void property="text"> 
-      <string>CutOutSource</string> 
+      <string>TransformStream</string> 
      </void> 
     </void> 
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>533.842712474619</double> 
-     <double>706.7077195258237</double> 
+     <double>486.9335577265969</double> 
+     <double>640.636302316303</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
-   <object id="NoteNode5" class="com.horstmann.violet.NoteNode"> 
-    <void property="text"> 
+   <object id="ClassNode9" class="com.horstmann.violet.ClassNode"> 
+    <void property="name"> 
      <void property="text"> 
-      <string>Reads the contents of local files, both
-regular files, symlinks or block devices</string> 
+      <string>CutOutStream</string> 
      </void> 
     </void> 
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>836.7472580451137</double> 
-     <double>493.8376618407349</double> 
+     <double>555.9916340674516</double> 
+     <double>750.220757440409</double> 
     </void> 
    </object> 
   </void> 
   <void method="addNode"> 
-   <object id="ClassNode14" class="com.horstmann.violet.ClassNode"> 
-    <void property="attributes"> 
+   <object id="InterfaceNode3" class="com.horstmann.violet.InterfaceNode"> 
+    <void property="methods"> 
      <void property="text"> 
-      <string>fd : int
-size : off_t</string> 
+      <string>get_size()
+read()
+open()
+close()
+is_repeatable()</string> 
      </void> 
     </void> 
     <void property="name"> 
      <void property="text"> 
-      <string>FdSource</string> 
+      <string>«interface»
+Stream</string> 
      </void> 
     </void> 
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>846.3431457505072</double> 
-     <double>599.1219330881966</double> 
+     <double>688.5487814157467</double> 
+     <double>437.25152600545294</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode10" class="com.horstmann.violet.ClassNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>FdStream</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>680.6673668471356</double> 
+     <double>637.245696021424</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode11" class="com.horstmann.violet.ClassNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>FileStream</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>828.9404615480411</double> 
+     <double>642.40096597045</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="ClassNode12" class="com.horstmann.violet.ClassNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>FilteredStream</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>428.449880813367</double> 
+     <double>747.5389646099015</double> 
+    </void> 
+   </object> 
+  </void> 
+  <void method="addNode"> 
+   <object id="InterfaceNode4" class="com.horstmann.violet.InterfaceNode"> 
+    <void property="name"> 
+     <void property="text"> 
+      <string>«interface»
+SourceFile</string> 
+     </void> 
+    </void> 
+   </object> 
+   <object class="java.awt.geom.Point2D$Double"> 
+    <void method="setLocation"> 
+     <double>1000.6667341519202</double> 
+     <double>639.0812755928229</double> 
     </void> 
    </object> 
   </void> 
@@ -590,164 +484,6 @@ size : off_t</string>
    <object idref="ClassNode6"/> 
    <object idref="ClassNode7"/> 
   </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="ClassNode9"/> 
-   <object idref="InterfaceNode1"/> 
-  </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="InterfaceNode1"/> 
-  </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="ClassNode10"/> 
-   <object idref="InterfaceNode1"/> 
-  </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> 
-   </object> 
-   <object idref="ClassNode10"/> 
-   <object idref="InterfaceNode3"/> 
-  </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
-    <void property="bentStyle"> 
-     <object class="com.horstmann.violet.BentStyle" field="VH"/> 
-    </void> 
-    <void property="endArrowHead"> 
-     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
-    </void> 
-    <void property="endLabel"> 
-     <string>1</string> 
-    </void> 
-    <void property="startArrowHead"> 
-     <object class="com.horstmann.violet.ArrowHead" field="BLACK_DIAMOND"/> 
-    </void> 
-   </object> 
-   <object idref="ClassNode9"/> 
-   <object idref="InterfaceNode1"/> 
-  </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.NoteEdge"/> 
-   <object idref="ClassNode8"/> 
-   <object idref="NoteNode3"/> 
-  </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> 
-   </object> 
-   <object idref="ClassNode11"/> 
-   <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> 
-    <void property="lineStyle"> 
-     <object class="com.horstmann.violet.LineStyle" field="DOTTED"/> 
-    </void> 
-   </object> 
-   <object idref="ClassNode14"/> 
-   <object idref="InterfaceNode1"/> 
-  </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.NoteEdge"/> 
-   <object idref="ClassNode14"/> 
-   <object idref="NoteNode2"/> 
-  </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.NoteEdge"/> 
-   <object idref="ClassNode11"/> 
-   <object idref="NoteNode5"/> 
-  </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="ClassNode13"/> 
-   <object idref="ClassNode9"/> 
-  </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="ClassNode12"/> 
-   <object idref="ClassNode9"/> 
-  </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> 
-   </object> 
-   <object idref="ClassNode12"/> 
-   <object idref="InterfaceNode2"/> 
-  </void> 
-  <void method="connect"> 
-   <object class="com.horstmann.violet.NoteEdge"/> 
-   <object idref="InterfaceNode2"/> 
-   <object idref="NoteNode4"/> 
-  </void> 
   <void method="connect"> 
    <object class="com.horstmann.violet.ClassRelationshipEdge"> 
     <void property="endArrowHead"> 
@@ -761,21 +497,6 @@ size : off_t</string>
     </void> 
    </object> 
    <object idref="ClassNode6"/> 
-   <object idref="InterfaceNode3"/> 
-  </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 src</string> 
-    </void> 
-   </object> 
-   <object idref="ClassNode1"/> 
    <object idref="InterfaceNode1"/> 
   </void> 
   <void method="connect"> 
@@ -874,5 +595,131 @@ size : off_t</string>
    <object idref="ClassNode2"/> 
    <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> 
+    <void property="lineStyle"> 
+     <object class="com.horstmann.violet.LineStyle" field="DOTTED"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode8"/> 
+   <object idref="InterfaceNode3"/> 
+  </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="InterfaceNode3"/> 
+  </void> 
+  <void method="connect"> 
+   <object class="com.horstmann.violet.ClassRelationshipEdge"> 
+    <void property="bentStyle"> 
+     <object class="com.horstmann.violet.BentStyle" field="VH"/> 
+    </void> 
+    <void property="endArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="V"/> 
+    </void> 
+    <void property="endLabel"> 
+     <string>1</string> 
+    </void> 
+    <void property="startArrowHead"> 
+     <object class="com.horstmann.violet.ArrowHead" field="BLACK_DIAMOND"/> 
+    </void> 
+   </object> 
+   <object idref="ClassNode8"/> 
+   <object idref="InterfaceNode3"/> 
+  </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="ClassNode10"/> 
+   <object idref="InterfaceNode3"/> 
+  </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="ClassNode9"/> 
+   <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="ClassNode12"/> 
+   <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> 
+   </object> 
+   <object idref="ClassNode12"/> 
+   <object idref="InterfaceNode2"/> 
+  </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> 
+   </object> 
+   <object idref="ClassNode11"/> 
+   <object idref="InterfaceNode4"/> 
+  </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 src</string> 
+    </void> 
+   </object> 
+   <object idref="ClassNode1"/> 
+   <object idref="InterfaceNode3"/> 
+  </void> 
  </object> 
 </java> 
diff --git a/doc/devel/UML/iso_tree.violet.png b/doc/devel/UML/iso_tree.violet.png
index 225c94f..d445b4f 100644
Binary files a/doc/devel/UML/iso_tree.violet.png and b/doc/devel/UML/iso_tree.violet.png differ
diff --git a/doc/devel/UML/stream.violet b/doc/devel/UML/stream.violet
index a82f0c1..d488940 100644
--- a/doc/devel/UML/stream.violet
+++ b/doc/devel/UML/stream.violet
@@ -292,17 +292,18 @@ to the contents of another stream.</string>
    </object> 
   </void> 
   <void method="addNode"> 
-   <object id="ClassNode8" class="com.horstmann.violet.ClassNode"> 
+   <object id="InterfaceNode2" class="com.horstmann.violet.InterfaceNode"> 
     <void property="name"> 
      <void property="text"> 
-      <string>SourceFile</string> 
+      <string>«interface»
+SourceFile</string> 
      </void> 
     </void> 
    </object> 
    <object class="java.awt.geom.Point2D$Double"> 
     <void method="setLocation"> 
-     <double>886.7119036079306</double> 
-     <double>251.73001410241085</double> 
+     <double>920.6530291048848</double> 
+     <double>248.90158697766475</double> 
     </void> 
    </object> 
   </void> 
@@ -465,18 +466,6 @@ to the contents of another stream.</string>
    <object idref="ClassNode6"/> 
    <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> 
-   </object> 
-   <object idref="ClassNode1"/> 
-   <object idref="ClassNode8"/> 
-  </void> 
   <void method="connect"> 
    <object class="com.horstmann.violet.NoteEdge"/> 
    <object idref="InterfaceNode1"/> 
@@ -487,5 +476,17 @@ to the contents of another stream.</string>
    <object idref="ClassNode1"/> 
    <object idref="NoteNode0"/> 
   </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> 
+   </object> 
+   <object idref="ClassNode1"/> 
+   <object idref="InterfaceNode2"/> 
+  </void> 
  </object> 
 </java>