I think it's just XML, not SVG. <?xml version="1.0" standalone="no"?> <xournal creator="xournalpp 1.2.2" fileversion="4"> <title>Xourna

I think it's just XML, not SVG. <?xml version="1.0" standalone="no"?> <xournal creator="xournalpp 1.2.2" fileversion="4"> <title>Xournal++ document - see </title> <preview>iVBORw0KGgoAAAANSUhE...............</preview> <page width="612" height="792"> <background type="pdf" domain="absolute" filename="somebook.pdf" pageno="1"/> <layer/> </page> <page width="612" height="792"> <background type="pdf" pageno="2"/> <layer/> </page> ... <page width="612" height="792"> <background type="pdf" pageno="16"/> <layer> <stroke tool="highlighter" color="#00ff007f" width="9" fill="60" capStyle="butt">120 457.20601 540 457.20601</stroke> <stroke tool="highlighter" color="#00ff007f" width="9" fill="60" capStyle="butt">394.78 515.76399 540.01 515.76399</stroke> <stroke tool="highlighter" color="#00ff007f" width="0" fill="60" capStyle="butt">540.01 520.26399 540.01 520.26399</stroke> <stroke tool="highlighter" color="#00ff007f" width="9" fill="60" capStyle="butt">120 527.76399 156.1 527.76399</stroke> </layer> </page> Here's the top of the file for context.