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diff --git a/odb/odb/semantics/relational/column.hxx b/odb/odb/semantics/relational/column.hxx
new file mode 100644
index 0000000..b7a2c31
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+++ b/odb/odb/semantics/relational/column.hxx
@@ -0,0 +1,205 @@
+// file      : odb/semantics/relational/column.hxx
+// 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 unameable
+    {
+      typedef std::vector<contains*> contained_list;
+
+    public:
+      virtual string const&
+      type () const {return type_;}
+
+      virtual bool
+      null () const {return null_;}
+
+      virtual void
+      null (bool n) {null_ = n;}
+
+      virtual string const&
+      default_ () const {return default__;}
+
+      virtual void
+      default_ (string const& d) {default__ = d;}
+
+      virtual string const&
+      options () const {return options_;}
+
+      virtual 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:
+      column (string const& id, string const& type, bool null)
+          : unameable (id), type_ (type), null_ (null)
+      {
+      }
+
+      column (column const&, uscope&, graph&);
+      column (xml::parser&, uscope&, graph&);
+
+      virtual column&
+      clone (uscope&, graph&) const;
+
+      void
+      add_edge_right (contains& e)
+      {
+        contained_.push_back (&e);
+      }
+
+      using unameable::add_edge_right;
+
+      virtual string
+      kind () const
+      {
+        return "column";
+      }
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    protected:
+      void
+      serialize_attributes (xml::serializer&) const;
+
+    protected:
+      string type_;
+      bool null_;
+      string default__;
+      string options_;
+
+    private:
+      contained_list contained_;
+    };
+
+    class add_column: public column
+    {
+    public:
+      add_column (string const& id, string const& type, bool null)
+          : column (id, type, null) {}
+      add_column (column const& c, uscope& s, graph& g): column (c, s, g) {}
+      add_column (xml::parser& p, uscope& s, graph& g): column (p, s, g) {}
+
+      virtual add_column&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "add column";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class drop_column: public unameable
+    {
+    public:
+      drop_column (string const& id): unameable (id) {}
+      drop_column (drop_column const& c, uscope&, graph& g)
+          : unameable (c, g) {}
+      drop_column (xml::parser&, uscope&, graph&);
+
+    public:
+      typedef relational::table table_type;
+
+      table_type&
+      table () const {return dynamic_cast<table_type&> (scope ());}
+
+    public:
+      virtual drop_column&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "drop column";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class alter_column: public column
+    {
+    public:
+      virtual string const&
+      type () const {return base ().type ();}
+
+      bool
+      null_altered () const {return null_altered_;}
+
+      virtual bool
+      null () const {return null_altered_ ? null_ : base ().null ();}
+
+      virtual void
+      null (bool n) {null_ = n; null_altered_ = true;}
+
+      virtual string const&
+      default_ () const {return base ().default_ ();}
+
+      virtual string const&
+      options () const {return base ().options ();}
+
+    public:
+      column&
+      base () const {return dynamic_cast<column&> (alters_->base ());}
+
+    public:
+      alter_column (string const& id)
+          : column (id, "", false), alters_ (0), null_altered_ (false) {}
+      alter_column (alter_column const&, uscope&, graph&);
+      alter_column (xml::parser&, uscope&, graph&);
+
+      virtual alter_column&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const
+      {
+        return "alter column";
+      }
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+      virtual void
+      add_edge_left (alters& a)
+      {
+        assert (alters_ == 0);
+        alters_ = &a;
+      }
+
+    private:
+      alters* alters_;
+
+      bool null_altered_;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_COLUMN_HXX