<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <style type="text/css">
    body { max-width: 50em; font-family: georgia, times, serif; margin: 3em; }
    h1, h2 { font-weight: normal; }
    p.def { margin-top: 1.5em; font-family: courier; }
    p.def span { color: #555555; font-weight: bold; font-family: tahoma, sans-serif; font-size: 80%; }
    p.desc { margin-left: 1em; }
    pre { margin-left: 1em; }

    h1 