Thank you for the replies.

I'm not sure I realized that "no warnings" wouldn't affect warnings emitted by XML::Simple. I think I knew this in the back of my head, but I added that at some point and it must have worked--perhaps accidentally, combined with some other change--so I never considered it.

I also don't know why the warnings re-started recently.

In any case, I'm absolutely sure that $data itself was defined.

However, after a bunch more testing, I realized that I was getting these warnings for any undefined values in the data. And then I realized that the error was that SuppressEmpty => 0 was a mistake--it's supposed to be SuppressEmpty => undef (or the empty string). When I made this change, the warnings went away, and I got my desired empty XML in the output.

I have no idea why it (seemed to) work at one point and then go back to not working. However, it's clear that the SuppressEmpty setting was the right way to fix it.

Thanks again.

In reply to Re: "no warnings 'uninitialized'" failing by jest
in thread "no warnings 'uninitialized'" failing by jest

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.