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diff --git a/odb/semantics/relational/changelog.hxx b/odb/semantics/relational/changelog.hxx
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+++ b/odb/semantics/relational/changelog.hxx
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+// file      : odb/semantics/relational/changelog.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_CHANGELOG_HXX
+#define ODB_SEMANTICS_RELATIONAL_CHANGELOG_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class model;
+    class changeset;
+    class changelog;
+
+    class contains_model: public edge
+    {
+    public:
+      typedef relational::changelog changelog_type;
+      typedef relational::model model_type;
+
+      changelog_type&
+      changelog () const {return *changelog_;}
+
+      model_type&
+      model () const {return *model_;}
+
+    public:
+      void
+      set_left_node (changelog_type& n) {changelog_ = &n;}
+
+      void
+      set_right_node (model_type& n) {model_ = &n;}
+
+    protected:
+      changelog_type* changelog_;
+      model_type* model_;
+    };
+
+    class contains_changeset: public edge
+    {
+    public:
+      typedef relational::changelog changelog_type;
+      typedef relational::changeset changeset_type;
+
+      changelog_type&
+      changelog () const {return *changelog_;}
+
+      changeset_type&
+      changeset () const {return *changeset_;}
+
+    public:
+      void
+      set_left_node (changelog_type& n) {changelog_ = &n;}
+
+      void
+      set_right_node (changeset_type& n) {changeset_ = &n;}
+
+    protected:
+      changelog_type* changelog_;
+      changeset_type* changeset_;
+    };
+
+    class changelog: public graph, public node
+    {
+      typedef std::vector<contains_changeset*> contains_changeset_list;
+
+    public:
+      typedef relational::model model_type;
+      typedef relational::contains_model contains_model_type;
+
+      model_type&
+      model () const {return contains_model_->model ();}
+
+      contains_model_type&
+      contains_model () const {return *contains_model_;}
+
+    public:
+      typedef
+      pointer_iterator<contains_changeset_list::const_iterator>
+      contains_changeset_iterator;
+
+      contains_changeset_iterator
+      contains_changeset_begin () const
+      {
+        return contains_changeset_.begin ();
+      }
+
+      contains_changeset_iterator
+      contains_changeset_end () const
+      {
+        return contains_changeset_.end ();
+      }
+
+      contains_changeset_list::size_type
+      contains_changeset_size () const
+      {
+        return contains_changeset_.size ();
+      }
+
+    public:
+      changelog (): contains_model_ (0) {}
+      changelog (xml::parser&);
+
+      void
+      add_edge_left (contains_model_type& e)
+      {
+        assert (contains_model_ == 0);
+        contains_model_ = &e;
+      }
+
+      void
+      add_edge_left (contains_changeset& e)
+      {
+        contains_changeset_.push_back (&e);
+      }
+
+      virtual string
+      kind () const {return "changelog";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    private:
+      changelog (changelog const&);
+      changelog& operator= (changelog const&);
+
+    protected:
+      contains_model_type* contains_model_;
+      contains_changeset_list contains_changeset_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_CHANGELOG_HXX