gentoo-overlay/app-arch/xarchiver/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>xfce@gentoo.org</email>
    <name>XFCE Team</name>
  </maintainer>
  <upstream>
    <!-- applies to 0.5.4 -->
    <remote-id type="sourceforge">xarchiver</remote-id>
    <!-- applies to 0.5.4.8+ -->
    <remote-id type="github">ib/xarchiver</remote-id>
  </upstream>
</pkgmetadata>