code: @Override
  	protected void parse(Node node) {
  		NamedNodeMap attributes = node.getAttributes();
  		order = getValueRecursiveAsInteger(attributes.getNamedItem("order"));
  		unitsPerPixel = getValueRecursiveAsDouble(attributes.getNamedItem("units-per-pixel"));
  		href = getValueRecursive(attributes.getNamedItem("href"));
  		setParsed(true);
  	}
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