gentoo-overlay/app-emacs/zenburn/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>emacs</herd>
<longdescription>
  Zenburn is a low-contrast color theme. It's easy for your eyes and
  designed to keep you in the zone for long programming sessions.
</longdescription>
</pkgmetadata>