code: public static String getURI(Attributes attrs) {
  		String src = attrs.getValue(URI, SRC_ATTR);
  		return src != null ? src : LocationUtils.UNKNOWN_STRING;
  	}
docs: Returns the URI of an element (SAX flavor)
  
  @param attrs
  the element's attributes that hold the location information
  @return the element's URI or "<code>[unknown location]</code>" if
  <code>attrs</code> has no location information.