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I'm trying the add one property to the point class. 

By help from  StackOverflow I was directed to Manual Chapter 11.5 Extensible
Kernel using this I wrote the code below.

The code  will not compile and I get the error:
‘typename CGAL::Extended_homogeneous::Base’ names
'CGAL::Extended_homogeneous::Base’, which is not a class template|

== CODE == 
#include <CGAL/Extended_homogeneous.h>

template < typename K_, typename K_Base >
class My_base  : public K_Base::template Base<K_>::Type
{
  typedef typename K_Base::template Base<K_>::Type   OldK;

public:
  typedef K_                                Kernel;

  template < typename Kernel2 >
  struct Base { typedef My_base<Kernel2, K_Base>  Type; };
 };

template < typename RT_ >
struct MyKernel  : public CGAL::Type_equality_wrapper<My_base<MyKernel<RT_>,
CGAL::Homogeneous<RT_> >,  MyKernel<RT_> >
{};

#include <CGAL/Nef_polyhedron_3.h>
typedef MyKernel<CGAL::Gmpz>    Kernel;

typedef CGAL::Nef_polyhedron_3<Kernel>  Nef_Polyhedron;
typedef Nef_Polyhedron::Plane_3  Plane;

int main()
{
  Nef_Polyhedron half_space(Plane(1,1,1,1), Nef_Polyhedron::EXCLUDED);

  return 0;
}
====

If the inhertiance is changed to "public K_Base::Base::template B<K_>::Type" 
it
will compile but Then I miss the propeties from Extentensions I guess? Because
I get the error "Constructor not available for this kernel" when I run the
program.