note choroba In fact, it depends on the module in question. But, if the module uses [mod://Exporter], the second option only imports <c>is_valid</c> into the current namespace. All other functions still exist under their fully qualified names, so the memory should not matter. But, if the module exports a subroutine called "all" or something similarly simple, you can avoid a clash with your own "all" subroutine. The <c>qw</c> way keeps your namespace clean and under better control. <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-832495"> &#1604;&#1405;&#4285;† &#6514;&#6482;&#9898;&#10186;&#4281;&#5651;&#5511; &#5045;&#5651;&#5511;&#9137; &#4281;&#6514;&#119243;&#409;&#5651;&#5511; </div></div> 1015838 1015838