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diff --git a/xsd/examples/cxx/parser/polymorphism/supermen-pimpl.hxx b/xsd/examples/cxx/parser/polymorphism/supermen-pimpl.hxx
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+// file      : examples/cxx/parser/polymorphism/supermen-pimpl.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef SUPERMEN_PIMPL_HXX
+#define SUPERMEN_PIMPL_HXX
+
+#include "supermen-pskel.hxx"
+
+class person_pimpl: public virtual person_pskel
+{
+public:
+  virtual void
+  pre ();
+
+  virtual void
+  name (const std::string&);
+
+  virtual void
+  post_person ();
+};
+
+class superman_pimpl: public virtual superman_pskel,
+                      public person_pimpl
+{
+public:
+  virtual void
+  pre ();
+
+  virtual void
+  can_fly (bool);
+
+  // By default, post_superman() calls post_person(). In case of
+  // polymorphic parsing we want the opposite: post_person() calls
+  // post_superman().
+  //
+  virtual void
+  post_person ();
+
+  virtual void
+  post_superman ();
+};
+
+class batman_pimpl: public virtual batman_pskel,
+                    public superman_pimpl
+{
+public:
+  virtual void
+  pre ();
+
+  virtual void
+  wing_span (unsigned int);
+
+  // By default, post_batman() calls post_superman(). In case of
+  // polymorphic parsing we want the opposite: post_superman()
+  // calls post_batman().
+  //
+  virtual void
+  post_superman ();
+
+  virtual void
+  post_batman ();
+};
+
+class supermen_pimpl: public supermen_pskel
+{
+};
+
+#endif // SUPERMEN_PIMPL_HXX