<?xml version="1.0"?>

<html
  xmlns:pwp="http://www.cs.otago.ac.nz/staffpriv/ok/pwp.pl">
  <head><title>$SHELL</title></head>
  <body>
    <p pwp:ask="getenv('SHELL', Shell)"
    >The default shell is <span pwp:tag="-" pwp:use="Shell"/>.</p>
    <p pwp:ask="\+getenv('SHELL',_)">There is no default shell.</p>
  </body>
</html>
