anchor.diff:    !---------------------------------------------------------------------------------------------------------------------------------
     endfunction VTK_VAR_TEXT_R4
   
  -  !>This function is used to finalize the file opened and it has not inputs; the @libvtk manages the file unit without the
  +  !>Function for finalizing open file,  it has not inputs, @libvtk manages the file unit without the
     !>user's action.
  -  !> @note An example of usage is: E_IO=VTK_END().
  +  !> @note An example of usage is: \n
  +  !> @code ...
  +  !> E_IO=VTK_END()
  +  !> ... @endcode
     !> @return E_IO: integer(I4P) error flag
     function VTK_END() result(E_IO)
     !---------------------------------------------------------------------------------------------------------------------------------
  
positive.code:   !---------------------------------------------------------------------------------------------------------------------------------
    endfunction VTK_GEO_XML_CLOSEP
  
    !> Function that \b must be used when unstructured grid is used; it saves the connectivity of the unstructured gird.
    !> @note The vector \b connect must follow the VTK legacy standard. It is passed as \em assumed-shape array
    !> because its dimensions is related to the mesh dimensions in a complex way. Its dimensions can be calculated by the following
    !> equation: \f$dc = dc = \sum\limits_{i = 1}^{NC} {nvertex_i }\f$.
    !> Note that this equation is different from the legacy one. The XML connectivity convention is quite different from the
    !> legacy standard. As an example suppose we have a mesh composed by 2 cells, one hexahedron (8 vertices) and one pyramid with
    !> square basis (5 vertices); suppose that the basis of pyramid is constitute by a face of the hexahedron and so the two cells
    !> share 4 vertices. The above equation gives \f$dc=8+5=13\f$; the connectivity vector for this mesh can be: \n
    !> first cell \n
    !> connect(1)  = 0 identification flag of \f$1^\circ\f$ vertex of 1° cell \n
    !> connect(2)  = 1 identification flag of \f$2^\circ\f$ vertex of 1° cell \n
  
negative.code:   !---------------------------------------------------------------------------------------------------------------------------------
    endfunction GetUnit
  
    !> @brief Function for converting lower case characters of a string to upper case ones. @libvtk uses this function in
    !>        order to achieve case-insensitive: all character variables used within @libvtk functions are pre-processed by
    !>        Uppper_Case function before these variables are used. So the users can call @libvtk functions whitout pay attention of
    !>        the case of the kwywords passed to the functions: calling the function VTK_INI with the string
  