xmlns:xlink="http://www.w3.org/1999/xlink">

​

    <style type="text/css" >

      <![CDATA[

​

        circle.myGreen {

           stroke: #006600;

           fill:   #00cc00;

        }

       circle.myRed {

       stroke: #660000;

       fill:   #cc0000;

    }

​

      ]]>

    </style>

​

    <circle  class="myGreen" cx="40" cy="40"  r="24"/>

    <circle  class="myRed"   cx="40" cy="100" r="24"/>

</svg>