code: @Override
    public void addTag(String tagName, String tagValue)
    {
      if(tagValue == null)
        addEmptyTag(tagName);
      else
      {
        addOpeningTag(tagName);
        _xml.append(XMLUtils.xmlEncode(tagValue));
        addClosingTag(tagName);
      }
    }
docs: Adds a tag
  
  @param tagName the name of the tag to add
  @param tagValue the value of the tag to add