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diff --git a/odb/odb/semantics/relational/foreign-key.hxx b/odb/odb/semantics/relational/foreign-key.hxx
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+++ b/odb/odb/semantics/relational/foreign-key.hxx
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+// file      : odb/semantics/relational/foreign-key.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX
+#define ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX
+
+#include <iosfwd>
+
+#include <odb/semantics/relational/deferrable.hxx>
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/key.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class foreign_key: public key
+    {
+    public:
+      qname const&
+      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:
+      typedef relational::deferrable deferrable_type;
+
+      deferrable_type
+      deferrable () const {return deferrable_;}
+
+      bool
+      not_deferrable () const
+      {
+        return deferrable_ == deferrable_type::not_deferrable;
+      }
+
+      enum action_type
+      {
+        no_action,
+        cascade,
+        set_null
+      };
+
+      action_type
+      on_delete () const {return on_delete_;}
+
+    public:
+      foreign_key (string const& id,
+                   qname const& referenced_table,
+                   deferrable_type deferrable,
+                   action_type on_delete = no_action)
+          : key (id),
+            referenced_table_ (referenced_table),
+            deferrable_ (deferrable),
+            on_delete_ (on_delete)
+      {
+      }
+
+      foreign_key (foreign_key const&, uscope&, graph&);
+      foreign_key (xml::parser&, uscope&, graph&);
+
+      virtual foreign_key&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const
+      {
+        return "foreign key";
+      }
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    protected:
+      void
+      serialize_attributes (xml::serializer&) const;
+
+      void
+      serialize_content (xml::serializer&) const;
+
+    private:
+      qname referenced_table_;
+      columns referenced_columns_;
+      deferrable_type deferrable_;
+      action_type on_delete_;
+    };
+
+    std::ostream&
+    operator<< (std::ostream&, foreign_key::action_type);
+
+    std::istream&
+    operator>> (std::istream&, foreign_key::action_type&);
+
+    class add_foreign_key: public foreign_key
+    {
+    public:
+      add_foreign_key (string const& id,
+                       qname const& rt,
+                       deferrable_type d,
+                       action_type od = no_action)
+          : foreign_key (id, rt, d, od) {}
+      add_foreign_key (foreign_key const& fk, uscope& s, graph& g)
+          : foreign_key (fk, s, g) {}
+      add_foreign_key (xml::parser& p, uscope& s, graph& g)
+          : foreign_key (p, s, g) {}
+
+      virtual add_foreign_key&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "add foreign key";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class drop_foreign_key: public unameable
+    {
+    public:
+      drop_foreign_key (string const& id): unameable (id) {}
+      drop_foreign_key (drop_foreign_key const& dfk, uscope&, graph& g)
+          : unameable (dfk, g) {}
+      drop_foreign_key (xml::parser&, uscope&, graph&);
+
+      virtual drop_foreign_key&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "drop foreign key";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX