To convert foaf img:depiction data to an SVG you:
<svg width="100%" height="100%"> <image clip-path="url(#ref0)" opacity="1" width="put the http://jibbering.com/2002/3/#width literal here" height="put the http://jibbering.com/2002/3/#height literal here" x="0" y="0" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="put the uri of the photo here"> </image> <g clip-rule="evenodd" > <clipPath id="ref0"> <path id="pathref0" d="put the http://jibbering.com/2002/3/#polypath literal here" fill="red" /> </clipPath> </g> </svg>