code: @Override
      public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
  
          // update element stack
          stack.add(localName);
  
          // <context-param>
          if (elements("web-app", "context-param")) {
              currentName = null;
              currentValue = null;
          }
  
      }
docs: /*
  @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String,
  org.xml.sax.Attributes)