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diff --git a/odb/odb/semantics/relational/model.hxx b/odb/odb/semantics/relational/model.hxx
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+++ b/odb/odb/semantics/relational/model.hxx
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+// file      : odb/semantics/relational/model.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_MODEL_HXX
+#define ODB_SEMANTICS_RELATIONAL_MODEL_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class model: public graph, public qscope
+    {
+    public:
+      typedef relational::version version_type;
+
+      version_type
+      version () const {return version_;}
+
+      void
+      version (version_type v) {version_ = v;}
+
+    public:
+      model (version_type v): version_ (v) {}
+      model (model const&, graph&);
+      model (xml::parser&, graph&);
+
+      virtual string
+      kind () const {return "model";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    public:
+      using qscope::add_edge_left;
+      using qscope::add_edge_right;
+
+    private:
+      model (model const&);
+      model& operator= (model const&);
+
+    private:
+      version_type version_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_MODEL_HXX