not reproduced with Inkscape 0.47 r22583 on OS X 10.5.8:
<rect style="fill:none;fill-opacity:0.75294117999999999;stroke:#000000;stroke-opacity:1;stroke-width:10" id="rect3003" width="300" height="300" x="50" y="50" />
is export to XAML as
<Rectangle xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Canvas.Left="50" Canvas.Top="50" Width="300" Height="300" Name="rect3003" Stroke="#FF000000" StrokeThickness="10"/>
not reproduced with Inkscape 0.47 r22583 on OS X 10.5.8:
<rect
style=" fill:none; fill-opacity: 0.7529411799999 9999;stroke: #000000; stroke- opacity: 1;stroke- width:10"
id="rect3003"
width="300"
height="300"
x="50"
y="50" />
is export to XAML as
<Rectangle xmlns:x="http:// schemas. microsoft. com/winfx/ 2006/xaml" Canvas.Left="50" Canvas.Top="50" Width="300" Height="300" Name="rect3003" Stroke="#FF000000" StrokeThickness ="10"/>