This structure is a HashRef that contains ArrayRef. When you see { } its a HashRef, when you see [ ] its an ArrayRef. To loop through them, you have to dereference them.

Lets say your reference variable is called $VAR1 (obviously this name comes from Data::Dumper so use the real variable). You can do this:

# Bellow, you have two dereference
# The arrow dereferences the HashRef $VAR1
# The @{ } dereferences the ArrayRef under 'book' =>
foreach my $book ( @{ $VAR1->{'book'} } ) {

  # Then, each $book is another HashRef
  print $book->{'isbn'}, "\n";
  print $book->{'title'}, "\n";

  # But 'author' is an ArrayRef:
  foreach my $author ( @{ $book->{'author'} } ) {
    
    print "Author: ", $author, "\n";
  }
}

[download]

That does not print the XML code, of course, but nothing prevents you from reprinting the labels manually. Otherwise, you have to use an XML related module.

There are no stupid questions, but there are a lot of inquisitive idiots.
-- greengaroo

In reply to Re: XML::Simple XML / XMLin / XMLout? or something else? by greengaroo
in thread XML::Simple XML / XMLin / XMLout? or something else? by Roboz

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