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diff --git a/odb/odb/semantics/relational/table.hxx b/odb/odb/semantics/relational/table.hxx
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+++ b/odb/odb/semantics/relational/table.hxx
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+// file      : odb/semantics/relational/table.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_TABLE_HXX
+#define ODB_SEMANTICS_RELATIONAL_TABLE_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    class table: public qnameable, public uscope
+    {
+    public:
+      virtual string const&
+      options () const {return options_;}
+
+      virtual void
+      options (string const& o) {options_ = o;}
+
+      // Extra information.
+      //
+    public:
+      typedef std::map<string, string> extra_map;
+
+      extra_map&
+      extra () {return extra_map_;}
+
+      extra_map const&
+      extra () const {return extra_map_;}
+
+    public:
+      table (string const& id): qnameable (id) {}
+      table (table const&, qscope&, graph&, bool base = false);
+      table (xml::parser&, qscope&, graph&, bool base = false);
+
+      virtual table&
+      clone (qscope&, graph&) const;
+
+      virtual string
+      kind () const {return "table";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+      // Resolve ambiguity.
+      //
+      using qnameable::scope;
+
+    protected:
+      void
+      serialize_attributes (xml::serializer&) const;
+
+    protected:
+      string options_;
+      extra_map extra_map_;
+    };
+
+    class add_table: public table
+    {
+    public:
+      add_table (string const& id): table (id) {}
+      add_table (table const& t, qscope& s, graph& g): table (t, s, g) {}
+      add_table (xml::parser& p, qscope& s, graph& g): table (p, s, g) {}
+
+      virtual add_table&
+      clone (qscope&, graph&) const;
+
+      virtual string
+      kind () const {return "add table";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class drop_table: public qnameable
+    {
+    public:
+      drop_table (string const& id): qnameable (id) {}
+      drop_table (drop_table const& t, qscope&, graph& g): qnameable (t, g) {}
+      drop_table (xml::parser&, qscope&, graph&);
+
+      virtual drop_table&
+      clone (qscope&, graph&) const;
+
+      virtual string
+      kind () const {return "drop table";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class alter_table: public table
+    {
+    public:
+      alter_table (string const& id): table (id) {}
+      alter_table (alter_table const& at, qscope& s, graph& g)
+          : table (at, s, g, true) {}
+      alter_table (xml::parser& p, qscope& s, graph& g)
+          : table (p, s, g, true) {}
+
+      virtual alter_table&
+      clone (qscope&, graph&) const;
+
+      virtual string
+      kind () const {return "alter table";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_TABLE_HXX