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diff --git a/odb/semantics/relational/column.hxx b/odb/semantics/relational/column.hxx
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+// file      : odb/semantics/relational/column.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_COLUMN_HXX
+#define ODB_SEMANTICS_RELATIONAL_COLUMN_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/table.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class contains;
+
+    class column: public nameable
+    {
+      typedef std::vector<contains*> contained_list;
+
+    public:
+      column (string const& id, string const& type, bool null)
+          : nameable (id), type_ (type), null_ (null)
+      {
+      }
+
+      string const&
+      type () const
+      {
+        return type_;
+      }
+
+      bool
+      null () const
+      {
+        return null_;
+      }
+
+      string const&
+      default_ () const
+      {
+        return default__;
+      }
+
+      void
+      default_ (string const& d)
+      {
+        default__ = d;
+      }
+
+      string const&
+      options () const
+      {
+        return options_;
+      }
+
+      void
+      options (string const& o)
+      {
+        options_ = o;
+      }
+
+    public:
+      typedef relational::table table_type;
+
+      table_type&
+      table () const
+      {
+        return dynamic_cast<table_type&> (scope ());
+      }
+
+      // Key containment.
+      //
+    public:
+      typedef
+      pointer_iterator<contained_list::const_iterator>
+      contained_iterator;
+
+      contained_iterator
+      contained_begin () const
+      {
+        return contained_.begin ();
+      }
+
+      contained_iterator
+      contained_end () const
+      {
+        return contained_.end ();
+      }
+
+    public:
+      void
+      add_edge_right (contains& e)
+      {
+        contained_.push_back (&e);
+      }
+
+      using nameable::add_edge_right;
+
+      virtual string
+      kind () const
+      {
+        return "column";
+      }
+
+    private:
+      string type_;
+      bool null_;
+      string default__;
+      string options_;
+
+      contained_list contained_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_COLUMN_HXX