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diff --git a/libxsd-frontend/xsd-frontend/transformations/simplifier.cxx b/libxsd-frontend/xsd-frontend/transformations/simplifier.cxx
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+++ b/libxsd-frontend/xsd-frontend/transformations/simplifier.cxx
@@ -0,0 +1,167 @@
+// file      : xsd-frontend/transformations/simplifier.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#include <xsd-frontend/transformations/simplifier.hxx>
+
+#include <xsd-frontend/semantic-graph.hxx>
+#include <xsd-frontend/traversal.hxx>
+
+#include <cult/containers/vector.hxx>
+
+namespace XSDFrontend
+{
+  using namespace Cult;
+
+  namespace
+  {
+    struct Compositor: Traversal::All,
+                       Traversal::Choice,
+                       Traversal::Sequence
+    {
+      Compositor (SemanticGraph::Schema& root)
+          : root_ (root)
+      {
+      }
+
+      virtual Void
+      traverse (SemanticGraph::All& a)
+      {
+        // The all compositor cannot contain compositors.
+        //
+        if (a.contains_begin () == a.contains_end ())
+          remove (a);
+      }
+
+      virtual Void
+      traverse (SemanticGraph::Choice& c)
+      {
+        // Do the depth-first traversal so that we take into account
+        // the potential removal of nested compositors.
+        //
+        using SemanticGraph::Compositor;
+
+        for (Compositor::ContainsIterator i (c.contains_begin ());
+             i != c.contains_end ();)
+        {
+          edge_traverser ().dispatch (*i++);
+        }
+
+        Choice::contains (c);
+
+        if (c.contains_begin () == c.contains_end ())
+          remove (c);
+      }
+
+      virtual Void
+      traverse (SemanticGraph::Sequence& s)
+      {
+        // Do the depth-first traversal so that we take into account
+        // the potential removal of nested compositors.
+        //
+        using SemanticGraph::Compositor;
+
+        for (Compositor::ContainsIterator i (s.contains_begin ());
+             i != s.contains_end ();)
+        {
+          edge_traverser ().dispatch (*i++);
+        }
+
+        if (s.contains_begin () == s.contains_end ())
+          remove (s);
+      }
+
+    private:
+      virtual Void
+      remove (SemanticGraph::Compositor& c)
+      {
+        using SemanticGraph::Node;
+        using SemanticGraph::Choice;
+        using SemanticGraph::Complex;
+        using SemanticGraph::Compositor;
+
+        if (c.contained_particle_p ())
+        {
+          Compositor& com (c.contained_particle ().compositor ());
+
+          // Empty compositors in choice are important.
+          //
+          if (!com.is_a<Choice> ())
+            root_.delete_edge (com, c, c.contained_particle ());
+        }
+        else
+        {
+          Complex& con (
+            dynamic_cast<Complex&> (c.contained_compositor ().container ()));
+          root_.delete_edge (con, c, c.contained_compositor ());
+        }
+      }
+
+    private:
+      SemanticGraph::Schema& root_;
+    };
+
+    //
+    //
+    struct Type: Traversal::Complex
+    {
+      virtual Void
+      traverse (SemanticGraph::Complex& c)
+      {
+        if (c.contains_compositor_p ())
+          Complex::contains_compositor (c);
+      }
+    };
+
+    // Go into implied/included/imported schemas while making sure
+    // we don't process the same stuff more than once.
+    //
+    struct Uses: Traversal::Uses
+    {
+      virtual Void
+      traverse (Type& u)
+      {
+        SemanticGraph::Schema& s (u.schema ());
+
+        if (!s.context ().count ("xsd-frontend-simplifier-seen"))
+        {
+          s.context ().set ("xsd-frontend-simplifier-seen", true);
+          Traversal::Uses::traverse (u);
+        }
+      }
+    };
+  }
+
+  namespace Transformations
+  {
+    Void Simplifier::
+    transform (SemanticGraph::Schema& s, SemanticGraph::Path const&)
+    {
+      Traversal::Schema schema;
+      Uses uses;
+
+      schema >> uses >> schema;
+
+      Traversal::Names schema_names;
+      Traversal::Namespace ns;
+      Traversal::Names ns_names;
+      Type type;
+
+      schema >> schema_names >> ns >> ns_names >> type;
+
+      Compositor compositor (s);
+      Traversal::ContainsCompositor contains_compositor;
+      Traversal::ContainsParticle contains_particle;
+
+      type >> contains_compositor >> compositor;
+      compositor >> contains_particle >> compositor;
+
+      // Some twisted schemas do recusive inclusions.
+      //
+      s.context ().set ("xsd-frontend-simplifier-seen", true);
+
+      schema.dispatch (s);
+    }
+  }
+}