Attaching Style Sheets

<?xml-stylesheet type="text/css" href="slide.css" ?> 
<svg width="1027px" height="740px">
- - -
<defs>
  <style type="text/css">
    <![CDATA[
      rect     {stroke:black;fill:green;}
      line     {stroke:red;stroke-width:2}
      rect.box {stroke:none;fill:rgb(140, 189, 237)}
      text     {font-family:Arial;font-size:20}
    ]]>
  </style>
</defs>

Format of slide.css:

  polyline {stroke:red;stroke-width:3}
  line     {stroke:red;stroke-width:3}
  rect     {stroke:black;fill:white;}