Unit namespace

Hi,
I have a question about ansi-iso pascal.

I have 2 unit and a main file

=== file a.pas: ===
Unit A;

Interface

     Var X : Byte;

End;

=== file b.pas: ===
Unit B;

Interface

     Var X : Byte;

End;

=== file main.pas ===

Program main;

uses A, B

begin
     A.X := B.X;
end;

the istruction A.X := B.X; is standard or it came with borland dialet? 
Standard Pascal have "unit namespace"?

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