You're on the right track. I've never used XML::SAX::ByRecord, but I used the technique you describe extensively while building XML:Validator::Schema. Usually it's a simple matter of keeping a stack of data in your filter object. So when you see a category you do: 

  my $category_stack = $self->{category_stack} ||= [];
  push @$category_stack, 
    { some => $category, data => $here };

[download]

Then when you see a title and you're ready to finish work on the category you just pop it off: 

  my $category_stack = $self->{category_stack};
  my $category_data = pop @$category_stack;

[download]

Using a stack allows categories to nest. Popping off the category data means the stack is conservative and will shrink as stored data is used. You definitely want to avoid building a data structure that can contain all the category data in your file.

Does that make sense?

-sam

In reply to Re: Modifying Records with XML::SAX::ByRecord by samtregar
in thread Modifying Records with XML::SAX::ByRecord by Lorphos

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