code: public <T> T getChildValue(String namespace, String nodename, Class<T> type) throws ParsedNodeException {
          Object rawValue = getChildValue(namespace, nodename);
          if (rawValue == null) {
              return null;
          }
          return convertObject(rawValue, type);
      }
docs: Returns the value of the given node, converted to the passed type.
  @throws liquibase.parser.core.ParsedNodeException if there is an error converting the value