When I run your code, it seems to create an output file which matches your requirements (web_bu.xml). The 1st display-name text has been replaced, and the other 2 remain the same: 
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/n
+s/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:sch
+emaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/
+ns/j2ee/web-app_2_4.xsd">
<display-name>SOMEGUY</display-name>
<display-name>
        Apache-Axis Servlet</display-name>
<display-name>
        Axis Admin Servlet</display-name>
</web-app>

[download]

How do you want the output file to look?

In reply to Re: Missing values in XML::Twig Output by toolic
in thread Missing values in XML::Twig Output by TJRandall

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.