Xaml export. Tag "whiteSpaceCollapse" is not recognized

Step to reproduce the bug:
1- Open the attached file "dessin-1.svg" in InkScape
2- Save as Microsoft xaml (Silverlight=no)

In the xaml file the following attribute is not recognized by visual studio:
whiteSpaceCollapse="preserve"

Here is the xaml dump

The following generated xaml will be:
<?xml version="1.0" encoding="UTF-8"?>
<!--This file is NOT compatible with Silverlight-->
<Viewbox xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Stretch="Uniform">
  <Canvas Name="svg2" Width="744.09448819" Height="1052.3622047">
    <Canvas.RenderTransform>
      <TranslateTransform X="0" Y="0"/>
    </Canvas.RenderTransform>
    <Canvas.Resources/>
    <!--Unknown tag: sodipodi:namedview-->
    <!--Unknown tag: metadata-->
    <Canvas Name="layer1">
      <TextBlock xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" FontSize="40" FontWeight="Normal" FontFamily="sans-serif" FontStyle="normal" Foreground="#FF000000" Canvas.Left="168.57143" Canvas.Top="389,50507" Name="text4136">
        <Span whiteSpaceCollapse="preserve" FontSize="40">Hello World</Span>
      </TextBlock>
    </Canvas>
  </Canvas>
</Viewbox>