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diff --git a/examples/cxx/hybrid/evolution/passthrough/unknown-type-simpl.hxx b/examples/cxx/hybrid/evolution/passthrough/unknown-type-simpl.hxx
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+++ b/examples/cxx/hybrid/evolution/passthrough/unknown-type-simpl.hxx
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+// file      : examples/cxx/hybrid/evolution/passthrough/unknown-type-simpl.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef UNKNOWN_TYPE_SIMPL_HXX
+#define UNKNOWN_TYPE_SIMPL_HXX
+
+namespace transform
+{
+  // Customized unknown_type serializer implementation.
+  //
+  class unknown_type_simpl: public unknown_type_base_simpl
+  {
+  public:
+    // Low-level raw XML serialization callbacks.
+    //
+    virtual void
+    _serialize_attributes ();
+
+    virtual void
+    _serialize_content ();
+
+    // Helper functions.
+    //
+  private:
+    void
+    serialize (const xml::attributes&);
+
+    void
+    serialize (const xml::elements&);
+  };
+}
+
+#endif // UNKNOWN_TYPE_SIMPL_HXX