private void parseFields() {
        InputStream inputStream = null;
        inputStream = conf.getConfResourceAsInputStream(conf.get(MediaConstants.FIELDS_PROPERTY_FILE, ""));

        InputSource inputSource = new InputSource(inputStream);

        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(inputSource);
            Element rootElement = document.getDocumentElement();
            NodeList fieldList = rootElement.getElementsByTagName(MediaConstants.TAG_FIELD);
            for(int i = 0; i < fieldList.getLength(); i++) {
                Element element = (Element) fieldList.item(i);
                String fieldName = element.getAttribute(MediaConstants.ATTR_NAME);
                NodeList fieldSelectors = element.getElementsByTagName(MediaConstants.TAG_CSS_SELECTOR);
                NodeList fieldAttrs = element.getElementsByTagName(MediaConstants.TAG_ATTRIBUTE);
                String cssSelector = "";
                String fieldAttr = "";
                if(fieldSelectors.getLength() > 0) {
                    cssSelector = fieldSelectors.item(0).getTextContent();
                }
                if(fieldAttrs.getLength() > 0) {
                    fieldAttr = fieldAttrs.item(0).getTextContent();
                }
                fields.add(new ParseField(fieldName, cssSelector, fieldAttr));
            }
        } catch (ParserConfigurationException ex) {
            LOG.error(ex.toString());
        } catch(SAXException ex) {
            LOG.error(ex.toString());
        } catch(IOException ex) {
            LOG.error(ex.toString());
        }

    }