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diff --git a/libxsd-frontend/xsd-frontend/semantic-graph/annotation.hxx b/libxsd-frontend/xsd-frontend/semantic-graph/annotation.hxx
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+++ b/libxsd-frontend/xsd-frontend/semantic-graph/annotation.hxx
@@ -0,0 +1,89 @@
+// file      : xsd-frontend/semantic-graph/annotation.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef XSD_FRONTEND_SEMANTIC_GRAPH_ANNOTATION_HXX
+#define XSD_FRONTEND_SEMANTIC_GRAPH_ANNOTATION_HXX
+
+#include <xsd-frontend/semantic-graph/elements.hxx>
+
+namespace XSDFrontend
+{
+  namespace SemanticGraph
+  {
+    //
+    //
+    class Annotation;
+
+    class Annotates: public virtual Edge
+    {
+    public:
+      Annotation&
+      annotation ()
+      {
+        return *annotation_;
+      }
+
+    protected:
+      friend class Bits::Graph<Node, Edge>;
+
+      Annotates ()
+          : annotation_ (0)
+      {
+      }
+
+      Void
+      set_left_node (Annotation& a)
+      {
+        annotation_ = &a;
+      }
+
+      Void
+      set_right_node (Node&)
+      {
+      }
+
+      Void
+      set_right_node (Edge&)
+      {
+      }
+
+    private:
+      Annotation* annotation_;
+    };
+
+    //
+    //
+    class Annotation: public virtual Node
+    {
+    public:
+      WideString const&
+      documentation () const
+      {
+        return documentation_;
+      }
+
+    protected:
+      friend class Bits::Graph<Node, Edge>;
+
+      Annotation (Path const& file,
+                  UnsignedLong line,
+                  UnsignedLong column,
+                  WideString const& documentation)
+          : Node (file, line, column), documentation_ (documentation)
+      {
+      }
+
+      Void
+      add_edge_left (Annotates&)
+      {
+      }
+
+    private:
+      WideString documentation_;
+    };
+  }
+}
+
+#endif  // XSD_FRONTEND_SEMANTIC_GRAPH_ANNOTATION_HXX