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A.3.1 The Packages Characters, Wide_Characters, and Wide_Wide_Characters

Static Semantics

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   The library package Characters has the following declaration:
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package Ada.Characters is
  pragma Pure(Characters);
end Ada.Characters;
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     The library package Wide_Characters has the following declaration:
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package Ada.Wide_Characters is
  pragma Pure(Wide_Characters);
end Ada.Wide_Characters;
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     The library package Wide_Wide_Characters has the following declaration:
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package Ada.Wide_Wide_Characters is
  pragma Pure(Wide_Wide_Characters);
end Ada.Wide_Wide_Characters;

Implementation Advice

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     If an implementation chooses to provide implementation-defined operations on Wide_Character or Wide_String (such as case mapping, classification, 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.

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