As Data::Alias is not standard in the version of PERL I am using, this may not be what I am looking for. Perhaps I could give another example: 
my @shape  = ("round", "square", "polygon");
my @colour = ("red", "salmon", "purple" );
my @tag ;
 
for my $j ( 0..2 ) { 
  if ( ($shape[$j] eq "round") && ($colour[$j] eq "red") ) 
    {$tag[$j]=1;} else {$tag[$j]=0;}
  print "$shape[$j] $colour[$j] $tag[$j]\n";
                    }

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There must be a more elegant way of doing ths eg by using: my @x = ($shape, $colour. $tag) ; rather than having a separate list for each attribute.

In reply to Re^2: referencing list by pmilne
in thread referencing list by pmilne

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