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diff --git a/boost/geometry/core/interior_rings.hpp b/boost/geometry/core/interior_rings.hpp
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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to 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)
+
+#ifndef BOOST_GEOMETRY_CORE_INTERIOR_RINGS_HPP
+#define BOOST_GEOMETRY_CORE_INTERIOR_RINGS_HPP
+
+#include <cstddef>
+
+#include <boost/mpl/assert.hpp>
+#include <boost/range.hpp>
+#include <boost/type_traits/remove_const.hpp>
+
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+#include <boost/geometry/core/interior_type.hpp>
+
+namespace boost { namespace geometry
+{
+
+namespace traits
+{
+
+
+/*!
+    \brief Traits class defining access to interior_rings of a polygon
+    \details defines access (const and non const) to interior ring
+    \ingroup traits
+    \par Geometries:
+        - polygon
+    \par Specializations should provide:
+        - static inline INTERIOR& get(POLY&)
+        - static inline const INTERIOR& get(POLY const&)
+    \tparam Geometry geometry
+*/
+template <typename Geometry>
+struct interior_rings
+{
+    BOOST_MPL_ASSERT_MSG
+        (
+            false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
+            , (types<Geometry>)
+        );
+};
+
+
+} // namespace traits
+
+
+
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace core_dispatch
+{
+
+template
+<
+    typename GeometryTag,
+    typename Geometry
+>
+struct interior_rings {};
+
+
+template <typename Polygon>
+struct interior_rings<polygon_tag, Polygon>
+{
+    static inline
+    typename geometry::interior_return_type<Polygon>::type
+                apply(Polygon& polygon)
+    {
+        return traits::interior_rings
+            <
+                typename boost::remove_const<Polygon>::type
+            >::get(polygon);
+    }
+};
+
+
+} // namespace core_dispatch
+#endif
+
+
+
+/*!
+\brief Function to get the interior rings of a polygon (non const version)
+\ingroup interior_rings
+\note OGC compliance: instead of InteriorRingN
+\tparam Polygon polygon type
+\param polygon the polygon to get the interior rings from
+\return the interior rings (possibly a reference)
+*/
+
+template <typename Polygon>
+inline typename interior_return_type<Polygon>::type interior_rings(Polygon& polygon)
+{
+    return core_dispatch::interior_rings
+        <
+            typename tag<Polygon>::type,
+            Polygon
+        >::apply(polygon);
+}
+
+
+/*!
+\brief Function to get the interior rings of a polygon (const version)
+\ingroup interior_rings
+\note OGC compliance: instead of InteriorRingN
+\tparam Polygon polygon type
+\param polygon the polygon to get the interior rings from
+\return the interior rings (possibly a const reference)
+
+\qbk{distinguish,const version}
+*/
+template <typename Polygon>
+inline typename interior_return_type<Polygon const>::type interior_rings(
+            Polygon const& polygon)
+{
+    return core_dispatch::interior_rings
+        <
+            typename tag<Polygon>::type,
+            Polygon const
+        >::apply(polygon);
+}
+
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_CORE_INTERIOR_RINGS_HPP