Can you tell me why the following only returns something if I remove 'name' from the KeyAttr list. Can you provide list of keys to XMLin. Is it also possible to return something like: public_methods => members => AttributeDesc => parameters for 'desc'.

#!/usr/bin/perl
use feature ":5.14";
use warnings FATAL => qw(all);
use strict;
use Data::Dump qw(dump pp);
use XML::Simple;

my @list;
my $x = XMLin(<<'END', KeyAttr=>['name', 'declaration_name']);
  <classes>  
    <public_methods>
      <members const="no" kind="function" name="AttributeDesc" protect
+ion="public" static="no" virtualness="non_virtual" volatile="no">
        <parameters declaration_name="name" type="const std::string &a
+mp;"/>
        <parameters declaration_name="value" type="const std::string &
+amp;"/>
        <parameters declaration_name="desc" default_value="&quot;&quot
+;" type="const std::string &amp;"/>
      </members>
      <members const="no" kind="function" name="AttributeDesc" protect
+ion="public" static="no" virtualness="non_virtual" volatile="no"></me
+mbers>
    </public_methods>
  </classes>
END

# pp($x);

sub r($$$;$);
sub r($$$;$)
 {my ($r, $l, $e, $a) = @_;
  $a = [] unless $a;
  return unless $l and ref($l); 
  if (ref($l) =~ /HASH/)
   {for(sort keys %$l)
     {unless (/$e/)
       {push @$a,  $_;
        r($r, $l->{$_}, $e, $a);
        pop @$a;
       }
      else
       {&$r(@$a);
       }
     } 
   } 
  elsif (ref($l) =~ /ARRAY/)
   {for(1..@$l)
     {unless ($l->[$_-1] =~ /$e/)
       {push @$a,  $_;
        r($r, $l->[$_-1], $e, $a);
        pop @$a;
       }
      else
       {&$r(@$a);
       }
     } 
   } 
 }

r sub {push (@list, join(" => ", @_))}, $x, "desc";
# ret_ancestors sub {say "@_"}, $x, "desc";
my $elist = join("\n", @list);
print "$elist\n";
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