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diff --git a/odb/semantics/relational/foreign-key.hxx b/odb/semantics/relational/foreign-key.hxx
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+++ b/odb/semantics/relational/foreign-key.hxx
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+// file      : odb/semantics/relational/foreign-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_FOREIGN_KEY_HXX
+#define ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/key.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class foreign_key: public key
+    {
+    public:
+      enum action
+      {
+        no_action,
+        cascade
+      };
+
+      foreign_key (string const& id,
+                   string const& referenced_table,
+                   bool deferred,
+                   action on_delete = no_action)
+          : key (id),
+            referenced_table_ (referenced_table),
+            deferred_ (deferred),
+            on_delete_ (on_delete)
+      {
+      }
+
+    public:
+      string
+      referenced_table () const
+      {
+        return referenced_table_;
+      }
+
+      typedef std::vector<string> columns;
+
+      columns const&
+      referenced_columns () const
+      {
+        return referenced_columns_;
+      }
+
+      columns&
+      referenced_columns ()
+      {
+        return referenced_columns_;
+      }
+
+    public:
+      bool
+      deferred () const
+      {
+        return deferred_;
+      }
+
+    public:
+      action
+      on_delete () const
+      {
+        return on_delete_;
+      }
+
+    public:
+      virtual string
+      kind () const
+      {
+        return "foreign key";
+      }
+
+    private:
+      string referenced_table_;
+      columns referenced_columns_;
+      bool deferred_;
+      action on_delete_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX