note moritz It means <i>if an argument was passed to <c>setID</c>, and it was [doc://defined] (ie not [doc://undef]), then set the attribute <c>_id</c> to that argument</i>. <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-616540"> [http://perl6.org/|Perl 6 - the future is here, just unevenly distributed] </div></div> 988494 988494