code: public static String getLocationString(Element elem) {
  		Attr srcAttr = elem.getAttributeNodeNS(URI, SRC_ATTR);
  		if (srcAttr == null) {
  			return LocationUtils.UNKNOWN_STRING;
  		}
  		return srcAttr.getValue() + ":" + elem.getAttributeNS(URI, LINE_ATTR) + ":"
  				+ elem.getAttributeNS(URI, COL_ATTR);
  	}
docs: Returns the location of an element that has been processed by this pipe
  (DOM flavor). If the location is to be kept into an object built from
  this element, consider using {@link #getLocation(Element)} and the
  {@link Locatable} interface.
  
  @param elem
  the element that holds the location information
  @return a location string as defined by {@link Location}.