my $reached_limit = _service_throttle('xisbn',$limit);
my $url = "http://xisbn.worldcat.org/webservices/xid/isbn/".$isbn."?method=getEditions&format=xml&fl=form,year,lang,ed";
$url.="&ai=".$affiliate_id if $affiliate_id;
my $reached_limit = _service_throttle('xisbn',$limit);
my $url = "http://xisbn.worldcat.org/webservices/xid/isbn/".$isbn."?method=getEditions&format=xml&fl=form,year,lang,ed";
$url.="&ai=".$affiliate_id if $affiliate_id;