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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_TAGS_HPP
+#define BOOST_GEOMETRY_CORE_TAGS_HPP
+
+
+namespace boost { namespace geometry
+{
+
+// Tags defining strategies linked to coordinate systems
+
+/// Tag used for casting spherical/geographic coordinate systems
+struct spherical_tag {};
+
+
+/// Tag indicating Cartesian coordinate system family (cartesian,epsg)
+struct cartesian_tag {};
+
+/// Tag indicating Spherical polar coordinate system family
+struct spherical_polar_tag : spherical_tag {};
+
+/// Tag indicating Spherical equatorial coordinate system family
+struct spherical_equatorial_tag : spherical_tag {};
+
+/// Tag indicating Geographic coordinate system family (geographic)
+struct geographic_tag : spherical_tag {};
+
+
+
+// Tags defining tag hierarchy
+
+/// For single-geometries (point, linestring, polygon, box, ring, segment)
+struct single_tag {};
+
+
+/// For multiple-geometries (multi_point, multi_linestring, multi_polygon)
+struct multi_tag {};
+
+/// For point-like types (point, multi_point)
+struct pointlike_tag {};
+
+/// For linear types (linestring, multi-linestring, segment)
+struct linear_tag {};
+
+/// For areal types (polygon, multi_polygon, box, ring)
+struct areal_tag {};
+
+// Subset of areal types (polygon, multi_polygon, ring)
+struct polygonal_tag : areal_tag {}; 
+
+/// For volume types (also box (?), polyhedron)
+struct volumetric_tag {};
+
+
+// Tags defining geometry types
+
+
+/// "default" tag
+struct geometry_not_recognized_tag {};
+
+/// OGC Point identifying tag
+struct point_tag : single_tag, pointlike_tag {};
+
+/// OGC Linestring identifying tag
+struct linestring_tag : single_tag, linear_tag {};
+
+/// OGC Polygon identifying tag
+struct polygon_tag : single_tag, polygonal_tag {};
+
+/// Convenience (linear) ring identifying tag
+struct ring_tag : single_tag, polygonal_tag {};
+
+/// Convenience 2D or 3D box (mbr / aabb) identifying tag
+struct box_tag : single_tag, areal_tag {};
+
+/// Convenience segment (2-points) identifying tag
+struct segment_tag : single_tag, linear_tag {};
+
+
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_CORE_TAGS_HPP