SVG2XAML — <use>-element

Some of the hardest to translate concepts from SVG to XAML are definitions like symbol, marker, pattern, mask and their placement counterpart — use. I created some examples to define at least a target to transform XSL to. For instance:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <g id="rect">
      <rect width="15" height="15" fill="red" />
      <rect x="10" width="15" height="15" fill="green" />
    </g>
  </defs>
  <use x="5" y="5"  xlink:href="#rect"/>
  <use x="30" y="30" xlink:href="#rect"/>
</svg>

which was (manually) translated as

<Canvas xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Canvas.Resources>
    <Canvas x:Key="rect">
      <Rectangle Width="15" Height="15" Fill="red"/>
      <Rectangle Canvas.Left="10" Width="15" Height="15" Fill="green"/>
    </Canvas>
  </Canvas.Resources>
  <Canvas Canvas.Left="5" Canvas.Top="5" Width="25" Height="25">
    <Canvas.Background>
      <VisualBrush Stretch="None" Visual="{StaticResource rect}" />
    </Canvas.Background>
  </Canvas>
  <Canvas Canvas.Left="30" Canvas.Top="30" Width="25" Height="25">
    <Canvas.Background>
      <VisualBrush Stretch="None" Visual="{StaticResource rect}" />
    </Canvas.Background>
  </Canvas>
</Canvas>

I'm not too happy about having to specify the actual width and height. Does anyone know a better solution?

And a cautious first step into filters:

<?xml version="1.0"?>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="Gaussian_Blur">
      <feGaussianBlur in="SourceGraphic" stdDeviation="5"/>
    </filter>
  </defs>
  <ellipse cx="60" cy="150" rx="70" ry="40" style="fill:#0000ff;stroke:#ffff00;stroke-width:2;" />
  <ellipse cx="200" cy="150" rx="70" ry="40" style="fill:#ff0000;stroke:#ffff00;stroke-width:2;filter:url(#Gaussian_Blur)" />
  <rect width="140" height="80" x="280" y="110" style="fill:#ff0000;stroke:#ffff00;stroke-width:2;filter:url(#Gaussian_Blur)" />
</svg>

with counterpart

<?xml version="1.0" encoding="UTF-8"?>
<Viewbox Stretch="Uniform" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Canvas Width="280" Height="80">
    <Canvas.Resources>
      <Style x:Key="Gaussian_Blur" TargetType="FrameworkElement">
        <Setter Property="BitmapEffect" >
          <Setter.Value>
            <BlurBitmapEffect Radius="5" KernelType="Gaussian" />
          </Setter.Value>
        </Setter>
      </Style>
   </Canvas.Resources>
   <Ellipse Canvas.Left="0" Width="140" Height="80" Fill="#000FFF" Stroke="#FFFF00" StrokeThickness="2" />
   <Ellipse Canvas.Left="140" Style="{StaticResource Gaussian_Blur}" Width="140" Height="80" Fill="#FF0000" Stroke="#FFFF00" StrokeThickness="2" />
   <Rectangle Canvas.Left="280" Style="{StaticResource Gaussian_Blur}" Width="140" Height="80" Fill="#FF0000" Stroke="#FFFF00" StrokeThickness="2" />
  </Canvas>
</Viewbox>

Note that the Gaussian blur is applied to different shapes, both derived from FrameworkElement, and only to shapes of the right Style.