CGAL::General_polygon_with_holes_2<Polygon>
CGAL::Polygon_with_holes_2<Kernel,Container>
The kernels supplied by CGAL are models of PolygonTraits_2.
PolygonTraits_2
CGAL::Projection_traits_xy_3<K>
CGAL::Projection_traits_yz_3<K>
CGAL::Projection_traits_xz_3<K>