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A.3.1 The Packages Characters, Wide_Characters, and Wide_Wide_Characters

Static Semantics

1
The library package Characters has the following declaration: 
2
package Ada.Characters is
  pragma Pure(Characters);
end Ada.Characters;
3/2
{AI95-00395-01} The library package Wide_Characters has the following declaration: 
4/2
package Ada.Wide_Characters is
  pragma Pure(Wide_Characters);
end Ada.Wide_Characters;
5/2
{AI95-00395-01} The library package Wide_Wide_Characters has the following declaration:
6/2
package Ada.Wide_Wide_Characters is
  pragma Pure(Wide_Wide_Characters);
end Ada.Wide_Wide_Characters;

Implementation Advice

7/3
{AI95-00395-01} {AI05-0185-1} If an implementation chooses to provide implementation-defined operations on Wide_Character or Wide_String (such as collating and sorting, etc.) it should do so by providing child units of Wide_Characters. Similarly if it chooses to provide implementation-defined operations on Wide_Wide_Character or Wide_Wide_String it should do so by providing child units of Wide_Wide_Characters.
7.a/2
Implementation Advice: Implementation-defined operations on Wide_Character, Wide_String, Wide_Wide_Character, and Wide_Wide_String should be child units of Wide_Characters or Wide_Wide_Characters.

Extensions to Ada 95

7.b/2
{AI95-00395-01} The packages Wide_Characters and Wide_Wide_Characters are new. 

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