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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . D I M --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2012-2013, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- Defines the dimension terminology
+
+---------------------------
+-- Dimension Terminology --
+---------------------------
+
+-- * Dimensioned type
+
+-- A dimensioned type is a type (more accurately a first subtype) to which
+-- the aspect Dimension_System applies to.
+
+-- type Mks_Type is new Long_Long_Float
+-- with
+-- Dimension_System => (
+-- (Unit_Name => Meter, Unit_Symbol => 'm', Dim_Symbol => 'L'),
+-- (Unit_Name => Kilogram, Unit_Symbol => "kg", Dim_Symbol => 'M'),
+-- (Unit_Name => Second, Unit_Symbol => 's', Dim_Symbol => 'T'),
+-- (Unit_Name => Ampere, Unit_Symbol => 'A', Dim_Symbol => 'I'),
+-- (Unit_Name => Kelvin, Unit_Symbol => 'K', Dim_Symbol => "Θ"),
+-- (Unit_Name => Mole, Unit_Symbol => "mol", Dim_Symbol => 'N'),
+-- (Unit_Name => Candela, Unit_Symbol => "cd", Dim_Symbol => 'J'));
+
+-- * Dimensioned subtype
+
+-- A dimensioned subtype is a subtype directly defined from the dimensioned
+-- type and to which the aspect Dimension applies to.
+
+-- subtype Length is Mks_Type
+-- with
+-- Dimension => (Symbol => 'm',
+-- Meter => 1,
+-- others => 0);
+
+package System.Dim is
+ pragma Pure;
+
+end System.Dim;