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diff --git a/examples/cxx/hybrid/wildcard/envelope-pimpl.hxx b/examples/cxx/hybrid/wildcard/envelope-pimpl.hxx
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+++ b/examples/cxx/hybrid/wildcard/envelope-pimpl.hxx
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+// file      : examples/cxx/hybrid/wildcard/envelope-pimpl.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef ENVELOPE_PIMPL_HXX
+#define ENVELOPE_PIMPL_HXX
+
+namespace email
+{
+  // Customized envelope parser implementation. All wildcard events are
+  // routed to the _start_any_element, _end_any_element, _any_attribute,
+  // and _any_characters functions. We can dynamically select a parser
+  // from the _start_any_element after which all inner content will be
+  // automatically routed to this parser. At the end we will get a call
+  // to _end_any_element in which we can call post(), and save the data.
+  //
+  class envelope_pimpl: public envelope_base_pimpl
+  {
+  public:
+    envelope_pimpl ()
+        : depth_ (0), text_p_ (0), binary_p_ (0)
+    {
+    }
+
+    // Additional parsers for the wildcard content.
+    //
+    void
+    text_parser (xml_schema::string_pskel& p)
+    {
+      text_p_ = &p;
+    }
+
+    void
+    binary_parser (binary_pskel& p)
+    {
+      binary_p_ = &p;
+    }
+
+  public:
+    virtual void
+    _pre ();
+
+    // If the XSD runtime library was configured with polymorphism
+    // support, then _start_any_element has a third argument which
+    // is a dynamic type id that comes from xsi:type or substitution
+    // groups.
+    //
+#ifndef XSDE_POLYMORPHIC
+    virtual void
+    _start_any_element (const xml_schema::ro_string& ns,
+                        const xml_schema::ro_string& name);
+#else
+    virtual void
+    _start_any_element (const xml_schema::ro_string& ns,
+                        const xml_schema::ro_string& name,
+                        const char*);
+#endif
+
+    virtual void
+    _end_any_element (const xml_schema::ro_string& ns,
+                      const xml_schema::ro_string& name);
+
+    // If we need to be able to reset and reuse the parser after
+    // an error then we also need to override _reset() and reset
+    // the parsers that are used to handle wildcards.
+    //
+    virtual void
+    _reset ();
+
+  private:
+    std::size_t depth_;
+
+    // Parsers for the text and binary elements.
+    //
+  private:
+    xml_schema::string_pskel* text_p_;
+    binary_pskel* binary_p_;
+  };
+}
+
+#endif // ENVELOPE_PIMPL_HXX