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diff --git a/examples/cxx/parser/polymorphism/driver.cxx b/examples/cxx/parser/polymorphism/driver.cxx
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+// file      : examples/cxx/parser/polymorphism/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <iostream>
+
+#include "supermen-pskel.hxx" // Get the configuration macros (XSDE_*).
+
+#if defined(XSDE_REUSE_STYLE_MIXIN)
+#  include "supermen-pimpl-mixin.hxx"
+#elif defined(XSDE_REUSE_STYLE_TIEIN)
+#  include "supermen-pimpl-tiein.hxx"
+#else
+#  error this example requires mixin or tiein parser reuse support
+#endif
+
+using std::cerr;
+using std::endl;
+
+int
+main (int argc, char* argv[])
+{
+  // Check that the load in substitution and inheritance hashmaps
+  // is not too high.
+  //
+#ifndef NDEBUG
+  float load = (float) xml_schema::parser_smap_elements ();
+  load /= xml_schema::parser_smap_buckets ();
+
+  if (load > 0.8)
+  {
+    cerr << "substitution hashmap load is " << load << endl;
+    cerr << "time to increase XSDE_PARSER_SMAP_BUCKETS" << endl;
+  }
+
+#ifdef XSDE_PARSER_VALIDATION
+  load = (float) xml_schema::parser_imap_elements ();
+  load /= xml_schema::parser_imap_buckets ();
+
+  if (load > 0.8)
+  {
+    cerr << "inheritance hashmap load is " << load << endl;
+    cerr << "time to increase XSDE_PARSER_IMAP_BUCKETS" << endl;
+  }
+#endif
+#endif
+
+  const char* input;
+
+  if (argc < 2)
+  {
+    input = "STDIN";
+    cerr << "XML file not specified, reading from STDIN" << endl;
+  }
+  else
+    input = argv[1];
+
+  try
+  {
+    // Construct the parser.
+    //
+    xml_schema::string_pimpl string_p;
+    xml_schema::boolean_pimpl boolean_p;
+    xml_schema::unsigned_int_pimpl unsigned_int_p;
+
+    person_pimpl person_p;
+    superman_pimpl superman_p;
+    batman_pimpl batman_p;
+
+    xml_schema::parser_map_impl person_map (5); // 5 hashtable buckets
+    supermen_pimpl supermen_p;
+
+
+    person_p.parsers (string_p);
+    superman_p.parsers (string_p, boolean_p);
+    batman_p.parsers (string_p, boolean_p, unsigned_int_p);
+
+    // Here we are specifying several parsers that can be
+    // used to parse the person element.
+    //
+    person_map.insert (person_p);
+    person_map.insert (superman_p);
+    person_map.insert (batman_p);
+
+    supermen_p.person_parser (person_map);
+
+    // Parse the XML document. The last argument to the document's
+    // constructor indicates that we are parsing polymorphic XML
+    // documents.
+    //
+    xml_schema::document_pimpl doc_p (supermen_p, "supermen", true);
+
+    supermen_p.pre ();
+
+    if (argc < 2)
+      doc_p.parse (std::cin);
+    else
+      doc_p.parse (argv[1]);
+
+    supermen_p.post_supermen ();
+  }
+  catch (const xml_schema::parser_exception& e)
+  {
+    cerr << input << ":" << e.line () << ":" << e.column () << ": "
+         << e.text () << endl;
+    return 1;
+  }
+  catch (const std::ios_base::failure&)
+  {
+    cerr << input << ": unable to open or read failure" << endl;
+    return 1;
+  }
+
+  return 0;
+}