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diff --git a/odb/odb/semantics/relational/changeset.hxx b/odb/odb/semantics/relational/changeset.hxx
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+++ b/odb/odb/semantics/relational/changeset.hxx
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+// file      : odb/semantics/relational/changeset.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_CHANGESET_HXX
+#define ODB_SEMANTICS_RELATIONAL_CHANGESET_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class model;
+    class changeset;
+
+    class alters_model: public edge
+    {
+    public:
+      typedef relational::model model_type;
+      typedef relational::changeset changeset_type;
+
+      model_type&
+      model () const {return *model_;}
+
+      changeset_type&
+      changeset () const {return *changeset_;}
+
+    public:
+      alters_model () : model_ (0), changeset_ (0) {}
+
+      void
+      set_left_node (changeset_type& c)
+      {
+        assert (changeset_ == 0);
+        changeset_ = &c;
+      }
+
+      void
+      set_right_node (model_type& m)
+      {
+        assert (model_ == 0);
+        model_ = &m;
+      }
+
+    protected:
+      model_type* model_;
+      changeset_type* changeset_;
+    };
+
+    class changeset: public qscope
+    {
+    public:
+      typedef relational::version version_type;
+
+      version_type
+      version () const {return version_;}
+
+      // Returns model to which this changeset applies (as opposed to the
+      // ultimate base model). Note that it may not be set.
+      //
+      model&
+      base_model () const {return alters_model_->model ();}
+
+    public:
+      changeset (version_type v): version_ (v), alters_model_ (0) {}
+      changeset (changeset const&, qscope& base, graph&);
+      changeset (xml::parser&, qscope& base, graph&);
+
+      virtual string
+      kind () const {return "changeset";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    public:
+      virtual void
+      add_edge_left (alters_model& am)
+      {
+        assert (alters_model_ == 0);
+        alters_model_ = &am;
+      }
+
+      using qscope::add_edge_left;
+      using qscope::add_edge_right;
+
+    private:
+      version_type version_;
+      alters_model* alters_model_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_CHANGESET_HXX