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+// file      : odb/semantics/relational/index.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_SEMANTICS_RELATIONAL_INDEX_HXX
+#define ODB_SEMANTICS_RELATIONAL_INDEX_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/key.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    // Note that in our model indexes are defined in the table scope.
+    //
+    class index: public key
+    {
+    public:
+      string const&
+      type () const {return type_;}
+
+      string const&
+      method () const {return method_;}
+
+      string const&
+      options () const {return options_;}
+
+    public:
+      index (string const& id,
+             string const& t = string (),
+             string const& m = string (),
+             string const& o = string ())
+          : key (id), type_ (t), method_ (m), options_ (o) {}
+      index (index const&, uscope&, graph&);
+      index (xml::parser&, uscope&, graph&);
+
+      virtual index&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const
+      {
+        return "index";
+      }
+
+      virtual void
+      serialize (xml::serializer&) const;
+
+    protected:
+      void
+      serialize_attributes (xml::serializer&) const;
+
+    private:
+      string type_;    // E.g., "UNIQUE", etc.
+      string method_;  // E.g., "BTREE", etc.
+      string options_; // Database-specific index options.
+    };
+
+    class add_index: public index
+    {
+    public:
+      add_index (string const& id,
+                 string const& t = string (),
+                 string const& m = string (),
+                 string const& o = string ())
+          : index (id, t, m, o) {}
+      add_index (index const& i, uscope& s, graph& g): index (i, s, g) {}
+      add_index (xml::parser& p, uscope& s, graph& g): index (p, s, g) {}
+
+      virtual add_index&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "add index";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+
+    class drop_index: public unameable
+    {
+    public:
+      drop_index (string const& id): unameable (id) {}
+      drop_index (drop_index const& di, uscope&, graph& g)
+          : unameable (di, g) {}
+      drop_index (xml::parser&, uscope&, graph&);
+
+      virtual drop_index&
+      clone (uscope&, graph&) const;
+
+      virtual string
+      kind () const {return "drop index";}
+
+      virtual void
+      serialize (xml::serializer&) const;
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_INDEX_HXX