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+// file      : odb/semantics/relational/index.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_INDEX_HXX
+#define ODB_SEMANTICS_RELATIONAL_INDEX_HXX
+
+#include <odb/semantics/relational/elements.hxx>
+#include <odb/semantics/relational/key.hxx>
+#include <odb/semantics/relational/table.hxx>
+
+namespace semantics
+{
+  namespace relational
+  {
+    // Note that unlike other keys, indexes are defined in the model
+    // scope, not table scope.
+    //
+    class index: public key
+    {
+    public:
+      relational::table&
+      table () const
+      {
+        return contains_begin ()->column ().table ();
+      }
+
+    public:
+      index (string const& id)
+          : key (id)
+      {
+      }
+
+      virtual string
+      kind () const
+      {
+        return "index";
+      }
+    };
+  }
+}
+
+#endif // ODB_SEMANTICS_RELATIONAL_INDEX_HXX