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diff --git a/examples/cxx/hybrid/wildcard/envelope-simpl.hxx b/examples/cxx/hybrid/wildcard/envelope-simpl.hxx
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+// file      : examples/cxx/hybrid/wildcard/envelope-simpl.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef ENVELOPE_SIMPL_HXX
+#define ENVELOPE_SIMPL_HXX
+
+namespace email
+{
+  // Customized envelope serializer implementation. Here we implement
+  // the any_next, any, and serialize_any callbacks to serialize the
+  // wildcard content.
+  //
+  class envelope_simpl: public envelope_base_simpl
+  {
+  public:
+    envelope_simpl ()
+        : text_s_ (0), binary_s_ (0)
+    {
+    }
+
+    // Additional serializers for the wildcard content.
+    //
+    void
+    text_serializer (xml_schema::string_sskel& s)
+    {
+      text_s_ = &s;
+    }
+
+    void
+    binary_serializer (binary_sskel& s)
+    {
+      binary_s_ = &s;
+    }
+
+  public:
+    virtual void
+    _pre ();
+
+    virtual bool
+    any_next ();
+
+    virtual void
+    any (std::string& ns, std::string& name);
+
+    virtual void
+    serialize_any ();
+
+    // If we need to be able to reset and reuse the serializer
+    // after an error then we also need to override _reset() and
+    // reset the serializers that are used to handle wildcards.
+    //
+    virtual void
+    _reset ();
+
+  private:
+    envelope::custom_data_const_iterator i_;
+
+    // Serializers for the text and binary elements.
+    //
+  private:
+    xml_schema::string_sskel* text_s_;
+    binary_sskel* binary_s_;
+  };
+}
+
+#endif // ENVELOPE_SIMPL_HXX