Create SVG anchor element programmatically?

Question

How do I create an SVG anchor through JavaScript? Please see relevant section and an example from spec. How do I convert this example to JavaScript (basically, how to dynamically generate the container element a so that when I click the ellipse, it navigates away.

<?xml version="1.0"?>
<svg width="5cm" height="3cm" viewBox="0 0 5 3" version="1.2" baseProfile="tiny"
     xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">

  <title>Example 17_01</title>
  <desc>A simple link on an ellipse.</desc>
  <rect x=".01" y=".01" width="4.98" height="2.98" 
        fill="none" stroke="blue"  stroke-width=".03"/>
  <a xlink:href="http://www.w3.org/">
    <ellipse cx="2.5" cy="1.5" rx="2" ry="1"
             fill="red" />
  </a>
</svg>

Answer 1

This is just basic DOM:

var xlinkNS="http://www.w3.org/1999/xlink", svgNS="http://www.w3.org/2000/svg";

var a = document.createElementNS(svgNS, "a");
a.setAttributeNS(xlinkNS,"href","http://www.w3.org/");

var ellipse = document.createElementNS(svgNS, "ellipse");
ellipse.setAttributeNS(null,"cx","2.5");
ellipse.setAttributeNS(null,"cy","1.5");
ellipse.setAttributeNS(null,"rx","2");
ellipse.setAttributeNS(null,"ry","1");
ellipse.setAttributeNS(null,"fill","red");

a.appendChild(ellipse);
document.documentElement.appendChild(a);