+ if ($args{'identifier'})
+ {
+ for (@{$args{'identifier'}})
+ {
+ my $identifier = $_;
+ my $ident_str;
+
+ if (ref ($identifier) ne 'HASH')
+ {
+ cluck ("The argument of the `identifier' "
+ . "option must be an array reference "
+ . "of hash references.");
+ return;
+ }
+
+ $ident_str = _create_identifier ($identifier);
+ if (!$ident_str)
+ {
+ return;
+ }
+
+ $msg .= ' identifier=' . _escape_argument ($ident_str);
+ }
+ }
+