Used to include large blocks of text with lots of normally
illegal literal characters like
< and &, typically XML or HTML.
<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/Graphics/SVG/SVG-19991203.dtd"
width="12cm" height="10cm">
<ellipse rx="110" ry="130" />
<rect x="4cm" y="1cm" width="3cm" height="6cm" />
</svg>
]]>
CDATA is for human authors, not for programs!