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diff --git a/odb/semantics/relational/elements.txx b/odb/semantics/relational/elements.txx
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+++ b/odb/semantics/relational/elements.txx
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+// file      : odb/semantics/relational/elements.txx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+namespace semantics
+{
+  namespace relational
+  {
+    // scope
+    //
+
+    template <typename N>
+    typename scope<N>::names_iterator scope<N>::
+    find (name_type const& name)
+    {
+      typename names_map::iterator i (names_map_.find (name));
+
+      if (i == names_map_.end ())
+        return names_.end ();
+      else
+        return i->second;
+    }
+
+    template <typename N>
+    typename scope<N>::names_const_iterator scope<N>::
+    find (name_type const& name) const
+    {
+      typename names_map::const_iterator i (names_map_.find (name));
+
+      if (i == names_map_.end ())
+        return names_.end ();
+      else
+        return names_const_iterator (i->second);
+    }
+
+    template <typename N>
+    typename scope<N>::names_iterator scope<N>::
+    find (names_type const& e)
+    {
+      typename names_iterator_map::iterator i (iterator_map_.find (&e));
+      return i != iterator_map_.end () ? i->second : names_.end ();
+    }
+
+    template <typename N>
+    typename scope<N>::names_const_iterator scope<N>::
+    find (names_type const& e) const
+    {
+      typename names_iterator_map::const_iterator i (iterator_map_.find (&e));
+      return i != iterator_map_.end () ? i->second : names_.end ();
+    }
+
+    class column;
+    class primary_key;
+
+    template <typename N>
+    void scope<N>::
+    add_edge_left (names_type& e)
+    {
+      nameable_type& n (e.nameable ());
+      name_type const& name (e.name ());
+
+      typename names_map::iterator i (names_map_.find (name));
+
+      if (i == names_map_.end ())
+      {
+        typename names_list::iterator i;
+
+        // We want the order to be columns first, then the primary key,
+        // and then the foreign keys.
+        //
+        if (n.is_a<column> ())
+          i = names_.insert (first_key_, &e);
+        else
+        {
+          if (n.is_a<primary_key> ())
+            first_key_ = i = names_.insert (first_key_, &e);
+          else
+          {
+            i = names_.insert (names_.end (), &e);
+
+            if (first_key_ == names_.end ())
+              first_key_ = i;
+          }
+        }
+
+        names_map_[name] = i;
+        iterator_map_[&e] = i;
+      }
+      else
+        throw duplicate_name (*this, (*i->second)->nameable (), n);
+    }
+  }
+}