-- --------------------------------------------------------------------------
--
-- Title      : Draft Standard VHDL 1076.1.1 Packages for Multiple Energy 
--            : Domain Support.
--
-- Library    : This package shall be compiled into a library symbolically
--            : named IEEE.
--
-- Developers : IEEE 1076.1.1 Working Group
--
-- Purpose    : This package contains declarations for modeling in the
--            : radiant energy domain.
--
-- Note       :
--
-- --------------------------------------------------------------------------
--   Modification History :
--
--   Version   Date           Description
--     1.0     6 July 2001    Original version.
--     1.1     4 March 2002   FDL 2001 & BMAS 2001 revisions
--     1.2     31 Aug 2002    DAC 2002 revisions
--     1.3     30 Sep 2002    FDL 2002 revisions
-- --------------------------------------------------------------------------

library IEEE;
    use IEEE.FUNDAMENTAL_CONSTANTS.all;

package RADIANT_SYSTEMS is
   -- type declarations

   -- subtype declarations
   subtype ILLUMINANCE is REAL tolerance "DEFAULT_ILLUMINANCE";
   subtype OPTIC_FLUX  is REAL tolerance "DEFAULT_OPTIC_FLUX";

   -- attribute declarations
   attribute UNIT of ILLUMINANCE : subtype is "candela";
   attribute UNIT of OPTIC_FLUX  : subtype is "lumen";
   -- SYMBOL is abbreviation of UNIT
   attribute SYMBOL of ILLUMINANCE : subtype is "can";
   attribute SYMBOL of OPTIC_FLUX  : subtype is "lum";

   -- nature declarations
   nature RADIANT is
      ILLUMINANCE across
      OPTIC_FLUX  through
      RADIANT_REF reference;
   nature RADIANT_VECTOR is array (NATURAL range <>) of RADIANT;

   -- vector subtype declarations
   subtype ILLUMINANCE_VECTOR is RADIANT_VECTOR'across;
   subtype OPTIC_FLUX_VECTOR  is RADIANT_VECTOR'through;

   -- attribute declarations
   attribute UNIT of ILLUMINANCE_VECTOR : subtype is "candela";
   attribute UNIT of OPTIC_FLUX_VECTOR  : subtype is "lumen";
   -- SYMBOL is abbreviation of UNIT
   attribute SYMBOL of ILLUMINANCE_VECTOR : subtype is "can";
   attribute SYMBOL of OPTIC_FLUX_VECTOR  : subtype is "lum";

   -- subnature declarations

   -- object declarations

   -- operation declarations (e.g., subprograms)

   -- alias declarations
end package RADIANT_SYSTEMS;