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diff --git a/libxsd-frontend/semantic-graph/element.hxx b/libxsd-frontend/semantic-graph/element.hxx
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+// file      : libxsd-frontend/semantic-graph/element.hxx
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef LIBXSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX
+#define LIBXSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX
+
+#include <libxsd-frontend/semantic-graph/elements.hxx>
+#include <libxsd-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_;
+      }
+
+    public:
+      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:
+      bool
+      substitutes_p () const
+      {
+        return substitutes_ != 0;
+      }
+
+      Substitutes&
+      substitutes () const
+      {
+        assert (substitutes_ != 0);
+        return *substitutes_;
+      }
+
+    public:
+      Element (Path const& file,
+               unsigned long line,
+               unsigned long column,
+               bool global,
+               bool 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  // LIBXSD_FRONTEND_SEMANTIC_GRAPH_ELEMENT_HXX