This is not just a question.

[Simen Kjaeraas]

module baseClass;

public class base {}

// end file

module subClass;

private import baseClass

public class sub : base {} // legal. base is imported from baseClass.

// end file

module subsubClass;

private import subClass;

public class subsub : sub {} // legal. sub is imported from subClass.

public class subsub2 : base {} // illegal. base is not imported, as it is  
a private import in subClass.

// end file

All public members of a module are imported with "private import X;" in  
module Y, but none are visible to modules that are in turn importing  
module Y.

-- 
Simen