set_tags_kind() uses this code to verify the tag kind: if ($_ ne 'translate' && $_ ne 'empty' && $_ ne 'verbatim' && $_ ne 'ignore' && $_ ne 'indent'); This seemed pretty long and unclear so I changed it to the equivalent: if ($_ !~ /^(translate|empty|verbatim|ignore|indent)$/); Which I feel is more compact, readable and maintainable. But as I said the two are functionally equivalent so it's partly a matter of taste. Anyway, here's the patch. Changelog: * po4a/lib/Locale/Po4a/Sgml.pm Francois Gouget <fgouget(a)free.fr&gt; Use a regular expression to simplify the tag kind check. -- Francois Gouget fgouget(a)free.fr http://fgouget.free.fr/ Nouvelle version : les anciens bogues ont \xE9t\xE9 remplac\xE9s par de nouveaux.