gentoo-overlay/app-editors/retext/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!-- maintainer-needed -->
  <upstream>
    <remote-id type="sourceforge">retext</remote-id>
    <remote-id type="github">retext-project/retext</remote-id>
    <remote-id type="pypi">ReText</remote-id>
  </upstream>
</pkgmetadata>