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diff --git a/examples/cxx/tree/polymorphism/README b/examples/cxx/tree/polymorphism/README
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+This example shows how to use XML Schema polymorphism features such as
+xsi:type attributes and substitution groups in the C++/Tree mapping.
+
+The example consists of the following files:
+
+supermen.xsd
+  XML Schema which describes the "supermen" instance documents.
+
+supermen.xml
+  Sample XML instance document.
+
+supermen.hxx
+supermen.cxx
+  C++ types that represent the given vocabulary, a set of parsing
+  functions that convert XML instance documents to a tree-like in-memory
+  object model, and a set of serialization functions that convert the
+  object model back to XML. These are generated by XSD from supermen.xsd.
+  Note the use of the --generate-polymorphic command line option.
+
+driver.cxx
+  Driver for the example. It first calls one of the parsing functions
+  that constructs the object model from the input file. It then prints
+  the content of the object model to STDERR. Finally, the driver serializes
+  the object model back to XML.
+
+To run the example on the sample XML instance document simply execute:
+
+$ ./driver instance.xml
diff --git a/examples/cxx/tree/polymorphism/driver.cxx b/examples/cxx/tree/polymorphism/driver.cxx
new file mode 100644
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+++ b/examples/cxx/tree/polymorphism/driver.cxx
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+// file      : examples/cxx/tree/polymorphism/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::auto_ptr
+#include <iostream>
+
+#include "supermen.hxx"
+
+using std::cerr;
+using std::endl;
+using std::auto_ptr;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " supermen.xml" << endl;
+    return 1;
+  }
+
+  try
+  {
+    auto_ptr<supermen> sm (supermen_ (argv[1]));
+
+    supermen copy (*sm); // Dynamic types are preserved in copies.
+
+    // Print what we've got.
+    //
+    for (supermen::person_const_iterator i (copy.person ().begin ());
+         i != copy.person ().end ();
+         ++i)
+    {
+      cerr << i->name ();
+
+      if (const superman* s = dynamic_cast<const superman*> (&*i))
+      {
+        if (s->can_fly ())
+          cerr << ", flying superman";
+        else
+          cerr << ", superman";
+      }
+
+      cerr << endl;
+    }
+
+    // Serialize back to XML.
+    //
+    xml_schema::namespace_infomap map;
+    map[""].schema = "supermen.xsd";
+
+    supermen_ (std::cout, copy, map);
+  }
+  catch (const xml_schema::exception& e)
+  {
+    cerr << e << endl;
+    return 1;
+  }
+}
diff --git a/examples/cxx/tree/polymorphism/makefile b/examples/cxx/tree/polymorphism/makefile
new file mode 100644
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+++ b/examples/cxx/tree/polymorphism/makefile
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+# file      : examples/cxx/tree/polymorphism/makefile
+# author    : Boris Kolpackov <boris@codesynthesis.com>
+# copyright : Copyright (c) 2005-2009 Code Synthesis Tools CC
+# license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+include $(dir $(lastword $(MAKEFILE_LIST)))../../../../build/bootstrap.make
+
+xsd := supermen.xsd
+cxx := driver.cxx
+
+obj := $(addprefix $(out_base)/,$(cxx:.cxx=.o) $(xsd:.xsd=.o))
+dep := $(obj:.o=.o.d)
+
+driver := $(out_base)/driver
+clean  := $(out_base)/.clean
+
+
+# Import.
+#
+$(call import,\
+  $(scf_root)/import/libxerces-c/stub.make,\
+  l: xerces_c.l,cpp-options: xerces_c.l.cpp-options)
+
+
+# Build.
+#
+$(driver): $(obj) $(xerces_c.l)
+
+$(obj) $(dep): cpp_options := -I$(src_root)/libxsd
+$(obj) $(dep): $(xerces_c.l.cpp-options)
+
+$(out_base)/$(xsd:.xsd=.hxx) \
+$(out_base)/$(xsd:.xsd=.ixx) \
+$(out_base)/$(xsd:.xsd=.cxx): xsd := $(out_root)/xsd/xsd
+
+$(out_base)/$(xsd:.xsd=.hxx) \
+$(out_base)/$(xsd:.xsd=.ixx) \
+$(out_base)/$(xsd:.xsd=.cxx): xsd_options := --generate-polymorphic --generate-serialization --root-element-last
+
+$(out_base)/$(xsd:.xsd=.hxx) \
+$(out_base)/$(xsd:.xsd=.ixx) \
+$(out_base)/$(xsd:.xsd=.cxx): $(out_root)/xsd/xsd
+
+$(call include-dep,$(dep))
+
+
+# Convenience alias for default target.
+#
+.PHONY: $(out_base)/
+$(out_base)/: $(driver)
+
+
+# Clean.
+#
+.PHONY: $(clean)
+
+$(clean): $(driver).o.clean                            \
+  $(addsuffix .cxx.clean,$(obj))                       \
+  $(addsuffix .cxx.clean,$(dep))                       \
+  $(addprefix $(out_base)/,$(xsd:.xsd=.cxx.xsd.clean))
+
+
+# How to.
+#
+$(call include,$(bld_root)/cxx/o-e.make)
+$(call include,$(bld_root)/cxx/cxx-o.make)
+$(call include,$(bld_root)/cxx/cxx-d.make)
+$(call include,$(scf_root)/xsd/tree/xsd-cxx.make)
+
+# Dependencies.
+#
+$(call import,$(src_root)/xsd/makefile)
diff --git a/examples/cxx/tree/polymorphism/supermen.xml b/examples/cxx/tree/polymorphism/supermen.xml
new file mode 100644
index 0000000..5053142
--- /dev/null
+++ b/examples/cxx/tree/polymorphism/supermen.xml
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+<?xml version="1.0"?>
+
+<!--
+
+file      : examples/cxx/tree/polymorphism/supermen.xml
+author    : Boris Kolpackov <boris@codesynthesis.com>
+copyright : not copyrighted - public domain
+
+-->
+
+<supermen xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:noNamespaceSchemaLocation="supermen.xsd">
+
+  <person>
+    <name>John Doe</name>
+  </person>
+  
+  <superman can-fly="false">
+    <name>James "007" Bond</name>
+  </superman>
+
+  <superman can-fly="true" wing-span="10" xsi:type="batman">
+    <name>Bruce Wayne</name>
+  </superman>
+  
+</supermen>
diff --git a/examples/cxx/tree/polymorphism/supermen.xsd b/examples/cxx/tree/polymorphism/supermen.xsd
new file mode 100644
index 0000000..ffdd21c
--- /dev/null
+++ b/examples/cxx/tree/polymorphism/supermen.xsd
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+<?xml version="1.0"?>
+
+<!--
+
+file      : examples/cxx/tree/polymorphism/supermen.xsd
+author    : Boris Kolpackov <boris@codesynthesis.com>
+copyright : not copyrighted - public domain
+
+-->
+
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+
+  <xsd:complexType name="person">
+    <xsd:sequence>
+      <xsd:element name="name" type="xsd:string"/>
+    </xsd:sequence>
+  </xsd:complexType>
+
+  <!-- substitution group root -->
+  <xsd:element name="person" type="person"/>
+
+
+  <xsd:complexType name="superman">
+    <xsd:complexContent>
+      <xsd:extension base="person">
+        <xsd:attribute name="can-fly" type="xsd:boolean" use="required"/>
+      </xsd:extension>
+    </xsd:complexContent>
+  </xsd:complexType>
+
+  <xsd:element name="superman" type="superman" substitutionGroup="person"/>
+
+  <xsd:complexType name="batman">
+    <xsd:complexContent>
+      <xsd:extension base="superman">
+        <xsd:attribute name="wing-span" type="xsd:unsignedInt" use="required"/>
+      </xsd:extension>
+    </xsd:complexContent>
+  </xsd:complexType>
+
+  <xsd:complexType name="supermen">
+    <xsd:sequence>
+      <xsd:element ref="person" maxOccurs="unbounded"/>
+    </xsd:sequence>
+  </xsd:complexType>
+
+  <xsd:element name="supermen" type="supermen"/>
+
+</xsd:schema>