docs: public boolean isETag( Name primaryType,
                             Set<Name> mixinTypes ) {
          if (etagNodeTypeNames.contains(primaryType)) return true;
          if (mixinTypes != null) {
              for (Name mixinType : mixinTypes) {
                  if (etagNodeTypeNames.contains(mixinType)) return true;
              }
          }
          return false;
      }