dominant-baseline is ignored.

Hi, I'm using rsvg (via the Haskell+Cairo bindings) and it seems that dominant-baseline is not taken into account. I tried with several different values and they're all being rendered the same incorrect way. Here's the SVG I'm using:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" height="180" width="320" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
  <text dominant-baseline="hanging" font-size="60" fill="white" x="160.0" text-anchor="middle" y="90">SVG</text>
  <circle fill="blue" cy="90" r="10" cx="160"/>
</svg>