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diff --git a/odb/semantics/relational/primary-key.hxx b/odb/semantics/relational/primary-key.hxx
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+++ b/odb/semantics/relational/primary-key.hxx
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+// file      : odb/semantics/relational/primary-key.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_PRIMARY_KEY_HXX
+#define ODB_SEMANTICS_RELATIONAL_PRIMARY_KEY_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/key.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class primary_key: public key
+    {
+    public:
+      bool
+      auto_ () const
+      {
+        return auto__;
+      }
+
+    public:
+      // Primary key has the implicit empty id.
+      //
+      primary_key (bool auto_)
+          : key (""), auto__ (auto_)
+      {
+      }
+
+      virtual string
+      kind () const
+      {
+        return "primary key";
+      }
+
+    private:
+      bool auto__;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_PRIMARY_KEY_HXX