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