You could use XSLT, although I suspect that few XSLT processors can do streaming transformation (ie they would probably need to load the entire document in memory before starting to work), but 1 - I might be wrong and 2 - it may not matter.

With XML::Twig you would write something like this (I am assuming here that content is an attribute of the meta element, as you did not show us the data you are working on): 

#!/usr/bin/perl

use strict;
use warnings;

use XML::Twig;

my $t= XML::Twig->new( twig_roots => { 'package/metadata/x-metadata/me
+ta[@name="dtb:totalTime"]'
                                          # $_ is the current element
                                       => sub { $_->set_att( content =
+> $_->att( 'content') +1);  $_->print; } },
                       twig_print_outside_roots => 1,
                     )
                ->parsefile( 'package.xml');

[download]

In reply to Re: Changing XML Data by mirod
in thread Changing XML Data by plendid

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.