Zb: An Early-Stage Build System(zombiezen.com)

  return derivation {
    name = "hello.txt";
    ["in"] = path "hello.txt";
    builder = "/bin/sh";
    system = "x86_64-linux";
    args = {"-c", "while read line; do echo \"$line\"; done < $in > $out"};
  }

  DIV {
   id="id";
   class="class;
   H1 "heading";
   P [[
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, 
    sed do eiusmod tempor ]] / EM incididunt / [[ ut labore et 
    dolore magna aliqua.
   ]];
   PRE ^ CODE [[ this is <code> tag inside <pre> ]];
  }