XPS as one of the PDLs languages is explained in this article. Along with it this page briefly answers the question "what is an XPS document?"...GradientStops> <GradientStop Color="sc#0.980392158, 1, 1, 1" Offset="0"...Offset="0" /> <GradientStop Color="sc#0.521568656, 1, 1, 1" Offset="1"...