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