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diff --git a/libxsd-frontend/xsd-frontend/semantic-graph/element.hxx b/libxsd-frontend/xsd-frontend/semantic-graph/element.hxx
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+++ b/libxsd-frontend/xsd-frontend/semantic-graph/element.hxx
@@ -0,0 +1,105 @@
+// file      : xsd-frontend/semantic-graph/element.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef XSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX
+#define XSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX
+
+#include <xsd-frontend/semantic-graph/elements.hxx>
+#include <xsd-frontend/semantic-graph/particle.hxx>
+
+namespace XSDFrontend
+{
+  namespace SemanticGraph
+  {
+    class Element;
+
+    class Substitutes: public virtual Edge
+    {
+    public:
+      Element&
+      substitution () const
+      {
+        return *substitution_;
+      }
+
+      Element&
+      root () const
+      {
+        return *root_;
+      }
+
+    protected:
+      friend class Bits::Graph<Node, Edge>;
+
+      Substitutes ()
+      {
+      }
+
+      Void
+      set_left_node (Element& n)
+      {
+        substitution_ = &n;
+      }
+
+      Void
+      set_right_node (Element& n)
+      {
+        root_ = &n;
+      }
+
+    private:
+      Element* root_;
+      Element* substitution_;
+    };
+
+
+    class Element: public virtual Member,
+                   public virtual Particle
+    {
+    public:
+      Boolean
+      substitutes_p () const
+      {
+        return substitutes_ != 0;
+      }
+
+      Substitutes&
+      substitutes () const
+      {
+        assert (substitutes_ != 0);
+        return *substitutes_;
+      }
+
+    protected:
+      friend class Bits::Graph<Node, Edge>;
+
+      Element (Path const& file,
+               UnsignedLong line,
+               UnsignedLong column,
+               Boolean global,
+               Boolean qualified);
+
+      Void
+      add_edge_left (Substitutes& e)
+      {
+        substitutes_ = &e;
+      }
+
+      Void
+      add_edge_right (Substitutes&)
+      {
+      }
+
+      using Member::add_edge_left;
+      using Member::add_edge_right;
+      using Particle::add_edge_right;
+
+    private:
+      Substitutes* substitutes_;
+    };
+  }
+}
+
+#endif  // XSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX