Also cross-posted from SO, an efficient solution with XML::Twig:

#!/usr/bin/perl

use strict;
use warnings;

use XML::Twig;

XML::Twig->new( twig_roots => { span       => sub { $_->set_tag( 'naps
+')->flush; },
                                expandable => sub { XML::Twig::Elt->ne
+w( expanded => 'this is an expanded element')->print; },
                              },
                twig_print_outside_roots => 1,
              )
          ->parsefile( \*DATA);
__DATA__
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:wicket="http://wicket
+.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<body>
<wicket:panel>
    <form wicket:id="mvpForm">
        <span>Edit Information: </span>
        <input type="checkbox" wicket:id="editForm"/>

        <span>Name: </span>
        <span wicket:id="name"></span>
        <input type="text" wicket:id="nameEdit"/>

        <span>Last Name: </span>
        <span wicket:id="lastName"></span>
        <input type="text" wicket:id="lastNameEdit"/>

        <span>DOB: </span>
        <span wicket:id="dob"></span>
        <input type="text" wicket:id="dobEdit"/>

        <span>Occupation: </span>
        <span wicket:id="occupation"></span>
        <input type="text" wicket:id="occupationEdit"/>

        <span>Gender: </span>
        <span wicket:id="gender"></span>
        <span wicket:id="genderEdit"/>

        <input type="submit" wicket:id="submit"/>

    </form>

<xmltag>
    <expandable/>
</xmltag>

</wicket:panel>
</body>
</html>

[download]

In reply to Re: Using Perl XML::SAX to modify XML documents by mirod
in thread Using Perl XML::SAX to modify XML documents by dryajov

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