gentoo-overlay/app-doc/pms/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer type="project">
  <email>pms@gentoo.org</email>
  <name>Package Manager Specification</name>
</maintainer>
<use>
  <flag name="binary">Download pre-built files instead of building
    from sources</flag>
  <flag name="html">Generate PMS as .html as well</flag>
</use>
</pkgmetadata>