parser.parse(is, this);
        } catch (final Exception e) {
            throw new GsaConfigException("Failed to parse XML file.", e);
        }
    }

    @Override
    public void startDocument() throws SAXException {
        tagQueue = new LinkedList<>();
        labelList = new ArrayList<>();
        labelType = null;
    }

    @Override
    public void endDocument() throws SAXException {