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diff --git a/libxsd-frontend/xsd-frontend/semantic-graph/complex.hxx b/libxsd-frontend/xsd-frontend/semantic-graph/complex.hxx
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+++ b/libxsd-frontend/xsd-frontend/semantic-graph/complex.hxx
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+// file      : xsd-frontend/semantic-graph/complex.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_COMPLEX_HXX
+#define XSD_FRONTEND_SEMANTIC_GRAPH_COMPLEX_HXX
+
+#include <xsd-frontend/semantic-graph/elements.hxx>
+#include <xsd-frontend/semantic-graph/compositors.hxx>
+
+#include <cult/containers/vector.hxx>
+
+namespace XSDFrontend
+{
+  namespace SemanticGraph
+  {
+    class Complex: public virtual Type, public virtual Scope
+    {
+    public:
+      Boolean
+      mixed_p () const
+      {
+        return mixed_;
+      }
+
+    public:
+      Boolean
+      contains_compositor_p ()
+      {
+        return contains_compositor_ != 0;
+      }
+
+      ContainsCompositor&
+      contains_compositor ()
+      {
+        assert (contains_compositor_ != 0);
+        return *contains_compositor_;
+      }
+
+    public:
+      Void
+      mixed_p (Boolean m)
+      {
+        mixed_ = m;
+      }
+
+    protected:
+      friend class Bits::Graph<Node, Edge>;
+
+      Complex (); // Virtual inheritance (Enumeration).
+      Complex (Path const& file, UnsignedLong line, UnsignedLong column);
+
+      using Type::add_edge_right;
+      using Type::add_edge_left;
+      using Scope::add_edge_left;
+
+      Void
+      add_edge_left (ContainsCompositor& e)
+      {
+        contains_compositor_ = &e;
+      }
+
+      Void
+      remove_edge_left (ContainsCompositor& e)
+      {
+        assert (contains_compositor_ == &e);
+        contains_compositor_ = 0;
+      }
+
+    private:
+      Boolean mixed_;
+      ContainsCompositor* contains_compositor_;
+    };
+  }
+}
+
+#endif  // XSD_FRONTEND_SEMANTIC_GRAPH_COMPLEX_HXX