First import from sources

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diff --git a/ieee-vital_timing.ads b/ieee-vital_timing.ads
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+--  Nodes recognizer for ieee.vital_timing.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+--  for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Iirs; use Iirs;
+
+package Ieee.Vital_Timing is
+   --  Attribute declarations.
+   Vital_Level0_Attribute : Iir_Attribute_Declaration := Null_Iir;
+   Vital_Level1_Attribute : Iir_Attribute_Declaration := Null_Iir;
+
+   --  Vital delay types.
+   VitalDelayType : Iir := Null_Iir;
+   VitalDelayType01   : Iir_Array_Type_Definition := Null_Iir;
+   VitalDelayType01Z  : Iir_Array_Type_Definition := Null_Iir;
+   VitalDelayType01ZX : Iir_Array_Type_Definition := Null_Iir;
+
+   VitalDelayArrayType     : Iir_Array_Type_Definition := Null_Iir;
+   VitalDelayArrayType01   : Iir_Array_Type_Definition := Null_Iir;
+   VitalDelayArrayType01Z  : Iir_Array_Type_Definition := Null_Iir;
+   VitalDelayArrayType01ZX : Iir_Array_Type_Definition := Null_Iir;
+
+   --  Extract declarations from IEEE.VITAL_Timing package.
+   procedure Extract_Declarations (Pkg : Iir_Package_Declaration);
+
+   procedure Check_Vital_Level0 (Unit : Iir_Design_Unit);
+   procedure Check_Vital_Level1 (Unit : Iir_Design_Unit);
+end Ieee.Vital_Timing;