After looking onto examples in distribution I have a feeling that DoxygenFilter doesn't support POD. It only adds support for Doxygen style documentation, here's one of the examples: 

## @file
# Useful helpers.

## @class
# Container for helper functions.
package Helper;

## @cmethod Helper new()
# Create a new Helper.
sub new {
}

## @fn $ upcase($string)
# Upcase a string.
# @param string a string to be upcased
# @return the upper-case version of string.
sub upcase {
    return uc(shift);
}

1;

[download]

Update: and yes DoxyFilt supports POD, so it seems it's a right tool for you.

In reply to Re^3: DoxygenFilter & DoxyFilt by zwon
in thread DoxygenFilter & DoxyFilt by rovingeyes

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.