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diff --git a/boost_ext/boost/bimap/relation/support/opposite_tag.hpp b/boost_ext/boost/bimap/relation/support/opposite_tag.hpp
new file mode 100644
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+++ b/boost_ext/boost/bimap/relation/support/opposite_tag.hpp
@@ -0,0 +1,61 @@
+// Boost.Bimap
+//
+// Copyright (c) 2006-2007 Matias Capeletto
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+/// \file relation/support/opposite_tag.hpp
+/// \brief Metafunction to obtain the opposite tag in a relation.
+
+#ifndef BOOST_BIMAP_RELATION_SUPPORT_OPPOSITE_TAG_HPP
+#define BOOST_BIMAP_RELATION_SUPPORT_OPPOSITE_TAG_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <boost/bimap/relation/detail/metadata_access_builder.hpp>
+
+/** \struct boost::bimaps::relation::support::opposite_tag
+
+\brief Metafunction to obtain the opposite tag in a relation.
+
+\code
+
+template< class Tag, class Relation >
+struct opposite_tag
+{
+        typedef {OppositeTag} type;
+};
+
+\endcode
+
+\ingroup relation_group
+                                                                    **/
+
+namespace boost {
+namespace bimaps {
+namespace relation {
+namespace support {
+
+// Implementation of const pair reference type by metafunction
+
+BOOST_BIMAP_SYMMETRIC_METADATA_ACCESS_BUILDER
+(
+    opossite_tag,
+    right_tag,
+    left_tag
+)
+
+} // namespace support
+} // namespace relation
+} // namespace bimaps
+} // namespace boost
+
+
+#endif // BOOST_BIMAP_RELATION_SUPPORT_OPPOSITE_TAG_HPP
+