code: @Override
      public void init(Configuration conf) {
          String rootName = conf.get(ConfigConstants.CONF_DELIMITED_ROOT_NAME, 
                  DEFAULT_ROOT_NAME);
          rootStart = '<' + rootName + '>';
          rootEnd = "</" + rootName + '>';
          
      }
docs: /*
  @see com.marklogic.contentpump.DocBuilder#init(java.lang.String)