docs: final Collection<JcrNodeType> subtypesFor( JcrNodeType nodeType ) {
          List<JcrNodeType> subtypes = new LinkedList<JcrNodeType>();
          for (JcrNodeType type : this.nodeTypes.values()) {
              if (type.supertypes().contains(nodeType)) {
                  subtypes.add(type);
              }
          }
          return subtypes;
      }