docs: public void setFormat(final String format) {
          if (format == null && this.format == null) {
              return;
          } else if (format == null) {
              removeChild(this.format);
              this.format = null;
          } else if (this.format == null) {
              this.format = new KeyValueNode<String>(CommonConstants.CS_FORMAT_TITLE, format);
              appendChild(this.format, false);
          } else {
              this.format.setValue(format);
          }
      }