XML::Twig may be a good candidate, if you use its simplify() method, then the changes against the XML::Simple based code may be fairly small. You'll just replace the outmost loop by a subroutine definition and instead of parsing the whole file and then looping, you'll tell XML::Twig to call that subroutine for each of those tags. Something like (PSEUDOCODE!): 

my $xml = XMLin($file);
for my $foo (@{$xml->{foo}) {
  #and now we process the $foo
}

=>

$xmltwig->parse( xml_roots => {
  'foo' => \&process_foo
});
sub process_foo {
  my ($xmltwig, $foo_obj) = @_;
  $foo = $foo_obj->simplify();
  #and now we process the $foo
}

[download]
(It's apparent that I hadn't used XML::Twig for years :-)

Another option is to use XML::Rules. It can tweak and simplify the generated structure as the file is parsed and like the XML::Twig, it allows you to execute code once a "twig" (a tag with all subtags and content) is fully parsed. See some of the examples on perlmonks or included with the module.

Jenda
Enoch was right!
Enjoy the last years of Rome.

In reply to Re: Parse XML of large size by Jenda
in thread Parse XML of large size by kalyanrajsista

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.