Represents a CDATA section like this example from a hypothetical SVG tutorial:
<p>You can use a default <code>xmlns</code> attribute to avoid 
having to add the svg prefix to all your elements:</p>
     <![CDATA[
       <svg xmlns="http://www.w3.org/2000/svg" 
            width="12cm" height="10cm">
         <ellipse rx="110" ry="130" />
         <rect x="4cm" y="1cm" width="3cm" height="6cm" />
       </svg>
     ]]>      
No children