perl5/site_perl/5.12.4/Template/Plugin/MultiMarkdown.pm
perl5/site_perl/5.12.4/Text/MultiMarkdown.pm
perl5/site_perl/5.12.4/Text/Markdown.pm

##</code><code>##

... other use statements
[% USE MultiMarkdown %]
... more template

[% FILTER multimarkdown %]

markdown stuff goes here

[% END %]