# putting the end tag /</idsDoc> in the right place
BEGIN                                                           {DOCCOUNT = 0;}

$0 ~  "</idsDoc>"                                               {}
$0 ~  "<idsDoc"                                                 {
                                                                  if(DOCCOUNT++ > 0){
								      print "  </idsDoc>";
								    };
								  print $0;
                                                                }
$0 ~  "</idsCorpus>"                                            {print "  </idsDoc>\n</idsCorpus>"}

$0 !~ "</idsDoc>" && $0 !~ "</idsCorpus>" && $0 !~ "<idsDoc"    {print}