gentoo-overlay/sci-mathematics/twelf/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!-- maintainer-needed -->
  <longdescription lang="en">
  Twelf is an implementation of the logical framework LF. It is used for
  logic programming and for the formalization of programming language
  theory.
  </longdescription>
</pkgmetadata>