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diff --git a/examples/cxx/tree/caching/README b/examples/cxx/tree/caching/README
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+This example shows how to use the the C++/Tree mapping to parse several
+XML documents while reusing the underlying XML parser and caching the
+schemas used for validation.
+
+The example consists of the following files:
+
+library.xsd
+  XML Schema which describes a library of books.
+
+library.xml
+  Sample XML instance document.
+
+library.hxx
+library.cxx
+  C++ types that represent the given vocabulary and a set of parsing
+  functions that convert XML instance documents to a tree-like in-memory
+  object model. These are generated by XSD from library.xsd.
+
+driver.cxx
+  Driver for the example. It first sets up the Xerces-C++ DOM parser
+  and caches the library.xsd schema for validation. It then performs
+  ten iterations that parse the input file to a DOM document using
+  the DOM parser and call one of the parsing functions that constructs
+  the object model from this DOM document. On each iteration the driver
+  prints a number of book in the object model to STDERR.
+
+To run the example on the sample XML instance document simply execute:
+
+$ ./driver library.xml
diff --git a/examples/cxx/tree/caching/driver.cxx b/examples/cxx/tree/caching/driver.cxx
new file mode 100644
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+// file      : examples/cxx/tree/caching/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::auto_ptr
+#include <fstream>
+#include <iostream>
+
+#include <xercesc/dom/DOM.hpp>
+#include <xercesc/util/XMLUniDefs.hpp> // chLatin_*
+#include <xercesc/util/PlatformUtils.hpp>
+#include <xercesc/validators/common/Grammar.hpp> // xercesc::Grammar
+#include <xercesc/framework/Wrapper4InputSource.hpp>
+
+#include <xsd/cxx/xml/dom/auto-ptr.hxx>
+#include <xsd/cxx/xml/dom/bits/error-handler-proxy.hxx>
+#include <xsd/cxx/xml/sax/std-input-source.hxx>
+
+#include <xsd/cxx/tree/exceptions.hxx>
+#include <xsd/cxx/tree/error-handler.hxx>
+
+#include "library.hxx"
+
+using namespace std;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " library.xml" << endl;
+    return 1;
+  }
+
+  int r (0);
+
+  // We need to initialize the Xerces-C++ runtime because we
+  // are doing the XML-to-DOM parsing ourselves.
+  //
+  xercesc::XMLPlatformUtils::Initialize ();
+
+  try
+  {
+    using namespace xercesc;
+    namespace xml = xsd::cxx::xml;
+    namespace tree = xsd::cxx::tree;
+
+    const XMLCh ls_id [] = {chLatin_L, chLatin_S, chNull};
+
+    // Get an implementation of the Load-Store (LS) interface.
+    //
+    DOMImplementation* impl (
+      DOMImplementationRegistry::getDOMImplementation (ls_id));
+
+#if _XERCES_VERSION >= 30000
+
+    // Xerces-C++ 3.0.0 and later.
+    //
+    xml::dom::auto_ptr<DOMLSParser> parser (
+      impl->createLSParser (DOMImplementationLS::MODE_SYNCHRONOUS, 0));
+
+    DOMConfiguration* conf (parser->getDomConfig ());
+
+    // Discard comment nodes in the document.
+    //
+    conf->setParameter (XMLUni::fgDOMComments, false);
+
+    // Enable datatype normalization.
+    //
+    conf->setParameter (XMLUni::fgDOMDatatypeNormalization, true);
+
+    // Do not create EntityReference nodes in the DOM tree. No
+    // EntityReference nodes will be created, only the nodes
+    // corresponding to their fully expanded substitution text
+    // will be created.
+    //
+    conf->setParameter (XMLUni::fgDOMEntities, false);
+
+    // Perform namespace processing.
+    //
+    conf->setParameter (XMLUni::fgDOMNamespaces, true);
+
+    // Do not include ignorable whitespace in the DOM tree.
+    //
+    conf->setParameter (XMLUni::fgDOMElementContentWhitespace, false);
+
+    // Enable/Disable validation.
+    //
+    conf->setParameter (XMLUni::fgDOMValidate, true);
+    conf->setParameter (XMLUni::fgXercesSchema, true);
+    conf->setParameter (XMLUni::fgXercesSchemaFullChecking, false);
+
+    // Set error handler.
+    //
+    tree::error_handler<char> eh;
+    xml::dom::bits::error_handler_proxy<char> ehp (eh);
+    conf->setParameter (XMLUni::fgDOMErrorHandler, &ehp);
+
+    // Initialize the schema cache.
+    //
+    parser->loadGrammar ("library.xsd", Grammar::SchemaGrammarType, true);
+    conf->setParameter (XMLUni::fgXercesUseCachedGrammarInParse, true);
+
+    // We will release the DOM document ourselves.
+    //
+    conf->setParameter (XMLUni::fgXercesUserAdoptsDOMDocument, true);
+
+#else // _XERCES_VERSION >= 30000
+
+    // Same as above but for Xerces-C++ 2 series.
+    //
+    xml::dom::auto_ptr<DOMBuilder> parser (
+      impl->createDOMBuilder(DOMImplementationLS::MODE_SYNCHRONOUS, 0));
+
+
+    parser->setFeature (XMLUni::fgDOMComments, false);
+    parser->setFeature (XMLUni::fgDOMDatatypeNormalization, true);
+    parser->setFeature (XMLUni::fgDOMEntities, false);
+    parser->setFeature (XMLUni::fgDOMNamespaces, true);
+    parser->setFeature (XMLUni::fgDOMWhitespaceInElementContent, false);
+    parser->setFeature (XMLUni::fgDOMValidation, true);
+    parser->setFeature (XMLUni::fgXercesSchema, true);
+    parser->setFeature (XMLUni::fgXercesSchemaFullChecking, false);
+
+    tree::error_handler<char> eh;
+    xml::dom::bits::error_handler_proxy<char> ehp (eh);
+    parser->setErrorHandler (&ehp);
+
+    parser->loadGrammar ("library.xsd", Grammar::SchemaGrammarType, true);
+    parser->setFeature (XMLUni::fgXercesUseCachedGrammarInParse, true);
+
+    parser->setFeature (XMLUni::fgXercesUserAdoptsDOMDocument, true);
+
+#endif // _XERCES_VERSION >= 30000
+
+    // Parse XML documents.
+    //
+    for (unsigned long i (0); i < 10; ++i)
+    {
+      ifstream ifs;
+      ifs.exceptions (ifstream::badbit | ifstream::failbit);
+      ifs.open (argv[1]);
+
+      // Wrap the standard input stream.
+      //
+      xml::sax::std_input_source isrc (ifs, argv[1]);
+      Wrapper4InputSource wrap (&isrc, false);
+
+      // Parse XML to DOM.
+      //
+#if _XERCES_VERSION >= 30000
+      xml_schema::dom::auto_ptr<DOMDocument> doc (parser->parse (&wrap));
+#else
+      xml_schema::dom::auto_ptr<DOMDocument> doc (parser->parse (wrap));
+#endif
+
+      eh.throw_if_failed<tree::parsing<char> > ();
+
+      // Parse DOM to the object model.
+      //
+      auto_ptr<library::catalog> c (library::catalog_ (*doc));
+
+      cerr << "catalog with " << c->book ().size () << " books" << endl;
+    }
+  }
+  catch (const xml_schema::exception& e)
+  {
+    cerr << e << endl;
+    r = 1;
+  }
+  catch (const std::ios_base::failure&)
+  {
+    cerr << argv[1] << ": unable to open or read failure" << endl;
+    r = 1;
+  }
+
+  xercesc::XMLPlatformUtils::Terminate ();
+  return r;
+}
diff --git a/examples/cxx/tree/caching/library.xml b/examples/cxx/tree/caching/library.xml
new file mode 100644
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+++ b/examples/cxx/tree/caching/library.xml
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+<?xml version="1.0"?>
+
+<!--
+
+file      : examples/cxx/tree/caching/library.xml
+author    : Boris Kolpackov <boris@codesynthesis.com>
+copyright : not copyrighted - public domain
+
+-->
+
+<lib:catalog xmlns:lib="http://www.codesynthesis.com/library"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	     xsi:schemaLocation="http://www.codesynthesis.com/library library.xsd">
+
+  <book id="MM" available="false">
+    <isbn>0679760806</isbn>
+    <title>The Master and Margarita</title>
+    <genre>fiction</genre>
+
+    <author recommends="WP">
+      <name>Mikhail Bulgakov</name>
+      <born>1891-05-15</born>
+      <died>1940-03-10</died>
+    </author>
+  </book>
+
+
+  <book id="WP">
+    <isbn>0679600841</isbn>
+    <title>War and Peace</title>
+    <genre>history</genre>
+
+    <author recommends="CP">
+      <name>Leo Tolstoy</name>
+      <born>1828-09-09</born>
+      <died>1910-11-20</died>
+    </author>
+  </book>
+
+
+  <book id="CP" available="false">
+    <isbn>0679420290</isbn>
+    <title>Crime and Punishment</title>
+    <genre>philosophy</genre>
+
+    <author>
+      <name>Fyodor Dostoevsky</name>
+      <born>1821-11-11</born>
+      <died>1881-02-09</died>
+    </author>
+  </book>
+
+</lib:catalog>
diff --git a/examples/cxx/tree/caching/library.xsd b/examples/cxx/tree/caching/library.xsd
new file mode 100644
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+++ b/examples/cxx/tree/caching/library.xsd
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+<?xml version="1.0"?>
+
+<!--
+
+file      : examples/cxx/tree/caching/library.xsd
+author    : Boris Kolpackov <boris@codesynthesis.com>
+copyright : not copyrighted - public domain
+
+-->
+
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+            xmlns:xse="http://www.codesynthesis.com/xmlns/xml-schema-extension"
+            xmlns:lib="http://www.codesynthesis.com/library"
+            targetNamespace="http://www.codesynthesis.com/library">
+
+  <xsd:simpleType name="isbn">
+    <xsd:restriction base="xsd:unsignedInt"/>
+  </xsd:simpleType>
+
+  <xsd:complexType name="title">
+    <xsd:simpleContent>
+      <xsd:extension base="xsd:string">
+        <xsd:attribute name="lang" type="xsd:language"/>
+      </xsd:extension>
+    </xsd:simpleContent>
+  </xsd:complexType>
+
+  <xsd:simpleType name="genre">
+    <xsd:restriction base="xsd:string">
+      <xsd:enumeration value="romance"/>
+      <xsd:enumeration value="fiction"/>
+      <xsd:enumeration value="horror"/>
+      <xsd:enumeration value="history"/>
+      <xsd:enumeration value="philosophy"/>
+    </xsd:restriction>
+  </xsd:simpleType>
+
+  <xsd:complexType name="person">
+    <xsd:sequence>
+      <xsd:element name="name" type="xsd:string"/>
+      <xsd:element name="born" type="xsd:date"/>
+      <xsd:element name="died" type="xsd:date" minOccurs="0"/>
+    </xsd:sequence>
+  </xsd:complexType>
+
+  <xsd:complexType name="author">
+    <xsd:complexContent>
+      <xsd:extension base="lib:person">
+	<xsd:attribute name="recommends" type="xsd:IDREF" xse:refType="lib:book"/>
+      </xsd:extension>
+    </xsd:complexContent>
+  </xsd:complexType>
+
+  <xsd:complexType name="book">
+    <xsd:sequence>
+      <xsd:element name="isbn" type="lib:isbn"/>
+      <xsd:element name="title" type="lib:title"/>
+      <xsd:element name="genre" type="lib:genre"/>
+      <xsd:element name="author" type="lib:author" maxOccurs="unbounded"/>
+    </xsd:sequence>
+    <xsd:attribute name="available" type="xsd:boolean" default="true"/>
+    <xsd:attribute name="id" type="xsd:ID" use="required"/>
+  </xsd:complexType>
+
+  <xsd:complexType name="catalog">
+    <xsd:sequence>
+      <xsd:element name="book" type="lib:book" maxOccurs="unbounded"/>
+    </xsd:sequence>
+  </xsd:complexType>
+
+  <xsd:element name="catalog" type="lib:catalog"/>
+
+</xsd:schema>
diff --git a/examples/cxx/tree/caching/makefile b/examples/cxx/tree/caching/makefile
new file mode 100644
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+++ b/examples/cxx/tree/caching/makefile
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+# file      : examples/cxx/tree/caching/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 := library.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)/$(xsd:.xsd=.cxx): xsd_options :=
+
+$(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)