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diff --git a/libxsd-frontend/semantic-graph/complex.hxx b/libxsd-frontend/semantic-graph/complex.hxx
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+++ b/libxsd-frontend/semantic-graph/complex.hxx
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+// file      : libxsd-frontend/semantic-graph/complex.hxx
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef LIBXSD_FRONTEND_SEMANTIC_GRAPH_COMPLEX_HXX
+#define LIBXSD_FRONTEND_SEMANTIC_GRAPH_COMPLEX_HXX
+
+#include <libxsd-frontend/semantic-graph/elements.hxx>
+#include <libxsd-frontend/semantic-graph/compositors.hxx>
+
+namespace XSDFrontend
+{
+  namespace SemanticGraph
+  {
+    class Complex: public virtual Type, public virtual Scope
+    {
+    public:
+      bool
+      abstract_p () const {return abstract_;}
+
+      bool
+      mixed_p () const
+      {
+        if (mixed_)
+          return true;
+
+        // If we have empty content, then we have the same content
+        // type as our base.
+        //
+        if (!contains_compositor_p () && inherits_p ())
+        {
+          if (Complex* b = dynamic_cast<Complex*> (&inherits ().base ()))
+            return b->mixed_p ();
+        }
+
+        return false;
+      }
+
+    public:
+      bool
+      contains_compositor_p () const
+      {
+        return contains_compositor_ != 0;
+      }
+
+      ContainsCompositor&
+      contains_compositor ()
+      {
+        assert (contains_compositor_ != 0);
+        return *contains_compositor_;
+      }
+
+    public:
+      void
+      mixed_p (bool m)
+      {
+        mixed_ = m;
+      }
+
+    public:
+      Complex (Path const& file,
+               unsigned long line,
+               unsigned long column,
+               bool abstract);
+
+      void
+      add_edge_left (ContainsCompositor& e)
+      {
+        contains_compositor_ = &e;
+      }
+
+      void
+      remove_edge_left (ContainsCompositor& e)
+      {
+        assert (contains_compositor_ == &e);
+        contains_compositor_ = 0;
+      }
+
+      using Type::add_edge_right;
+      using Type::add_edge_left;
+      using Scope::add_edge_left;
+
+    protected:
+      Complex (); // For virtual inheritance (Enumeration).
+
+    private:
+      bool abstract_;
+      bool mixed_;
+      ContainsCompositor* contains_compositor_;
+    };
+  }
+}
+
+#endif  // LIBXSD_FRONTEND_SEMANTIC_GRAPH_COMPLEX_HXX