I am generating PNG from SVG using the command line (WXPSP2)

inkscape.exe -e <imgFile> <svgFile>

My SVG file looks like

   <pattern id="myPattern".....>

 <path.... style="fill: url(#myPattern);"/>

When I generate the PNG I get the "Linked Image Not Found". If I open the
SVG file with Inkscape I get the same error, but if I replace the http:// by
a local path (file:/// because I run the Web server locally), it shows the

I can not embed the image and the URL is ok. In fact If I generate the PNG
using Batik it is working fine.

Is ther any problem using http:// form images? Is there any additional
argument I must pass to the command line?

Thanks a lot