(*
 * This file illustrates the basic use of of import/export.
 *
 * A module may export symbols to other modules, using an "export" declaration.
 * Exported symbols are available to any other module via an "import"
 * declaration.
 *
 * In the examples below, modules N and O contain exports.  Module M imports
 * from both N and O.
 * 
 * Note that exporting modules need not precede importing modules.  In the
 * examples below, the declaration of module M precedes both of the modules
 * from which it imports.
 *)
module M;
    import N.T;
    import O.U;

    op Op1(T);
    op Op2(U);
end M;

module N;
    export T;
    object T =  integer;
end N;

module O;
    export U;
    obj U =  integer;
end O;