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diff --git a/xsd/elements.hxx b/xsd/elements.hxx
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+// file      : xsd/elements.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2009 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef ELEMENTS_HXX
+#define ELEMENTS_HXX
+
+#include <cult/types.hxx>
+
+#include <xsd-frontend/semantic-graph.hxx>
+#include <xsd-frontend/traversal.hxx>
+
+using namespace Cult;
+typedef WideString String;
+
+namespace SemanticGraph = XSDFrontend::SemanticGraph;
+namespace Traversal = XSDFrontend::Traversal;
+
+
+// Anonymous feedback via belongs edge.
+//
+struct AnonymousBase : Traversal::Element,
+                       Traversal::Attribute
+{
+  AnonymousBase (Traversal::NodeDispatcherBase& d1)
+      : complex_ (&d1, 0)
+  {
+    edge_traverser (belongs_);
+    belongs_.node_traverser (complex_);
+  }
+
+  AnonymousBase (Traversal::NodeDispatcherBase& d1,
+                 Traversal::NodeDispatcherBase& d2)
+      : complex_ (&d1, &d2)
+  {
+    edge_traverser (belongs_);
+    belongs_.node_traverser (complex_);
+  }
+
+  // Hooks.
+  //
+public:
+  virtual void
+  member_pre (SemanticGraph::Member&)
+  {
+  }
+
+  virtual void
+  member_post (SemanticGraph::Member&)
+  {
+  }
+
+  /*
+    virtual void
+    type_pre (SemanticGraph::Type& t)
+    {
+    }
+
+    virtual void
+    type_post (SemanticGraph::Type& t)
+    {
+    }
+  */
+
+public:
+
+  virtual Void
+  traverse (SemanticGraph::Element& e)
+  {
+    SemanticGraph::Type& t (e.type ());
+
+    if (!t.named () && !t.context ().count ("seen"))
+    {
+      t.context ().set ("seen", true);
+
+      member_pre (e);
+
+      Element::belongs (e, belongs_);
+
+      member_post (e);
+
+      t.context ().remove ("seen");
+    }
+  }
+
+  virtual Void
+  traverse (SemanticGraph::Attribute& a)
+  {
+    SemanticGraph::Type& t (a.type ());
+
+    if (!t.named () && !t.context ().count ("seen"))
+    {
+      t.context ().set ("seen", true);
+
+      member_pre (a);
+
+      Attribute::belongs (a, belongs_);
+
+      member_post (a);
+
+      t.context ().remove ("seen");
+    }
+  }
+
+private:
+  struct Complex : Traversal::Complex
+  {
+    Complex (Traversal::NodeDispatcherBase* d1,
+             Traversal::NodeDispatcherBase* d2)
+        : d1_ (d1), d2_ (d2)
+    {
+    }
+
+    virtual Void
+    traverse (SemanticGraph::Complex& c)
+    {
+      if (d1_)
+        d1_->dispatch (c);
+
+      if (d2_)
+        d2_->dispatch (c);
+    }
+
+  private:
+    Traversal::NodeDispatcherBase* d1_;
+    Traversal::NodeDispatcherBase* d2_;
+
+  } complex_;
+
+  Traversal::Belongs belongs_;
+};
+
+#endif // ELEMENTS_HXX
+