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diff --git a/inheritance/polymorphism/employee.hxx b/inheritance/polymorphism/employee.hxx
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+++ b/inheritance/polymorphism/employee.hxx
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+// file      : inheritance/polymorphism/employee.hxx
+// copyright : not copyrighted - public domain
+
+#ifndef EMPLOYEE_HXX
+#define EMPLOYEE_HXX
+
+#include <string>
+
+#include <odb/core.hxx>
+
+#pragma db object polymorphic
+class person
+{
+public:
+  person (const std::string& first, const std::string& last)
+      : first_ (first), last_ (last)
+  {
+  }
+
+  const std::string&
+  first () const
+  {
+    return first_;
+  }
+
+  const std::string&
+  last () const
+  {
+    return last_;
+  }
+
+  virtual
+  ~person () = 0;
+
+  virtual void
+  print () = 0;
+
+protected:
+  friend class odb::access;
+  person () {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  std::string first_;
+  std::string last_;
+};
+
+#pragma db object
+class employee: public person
+{
+public:
+  employee (const std::string& first,
+            const std::string& last,
+            bool temporary)
+      : person (first, last), temporary_ (temporary)
+  {
+  }
+
+  bool
+  temporary () const
+  {
+    return temporary_;
+  }
+
+  void
+  temporary (bool t)
+  {
+    temporary_ = t;
+  }
+
+  virtual void
+  print ();
+
+private:
+  friend class odb::access;
+  employee () {}
+
+  bool temporary_;
+};
+
+#pragma db object
+class contractor: public person
+{
+public:
+  contractor (const std::string& first,
+              const std::string& last,
+              const std::string& email)
+      : person (first, last), email_ (email)
+  {
+  }
+
+  const std::string&
+  email () const
+  {
+    return email_;
+  }
+
+  virtual void
+  print ();
+
+private:
+  friend class odb::access;
+  contractor () {}
+
+  std::string email_;
+};
+
+#endif // EMPLOYEE_HXX