code: private void updateSubtreeMap(final ITreeData paramNode, final INodeReadTrx paramRtx) throws TTIOException {
          assert paramNode != null;
          assert paramRtx != null;
  
          mIsInSubtree.set(paramNode, paramNode, true);
          if (paramNode.hasParent()) {
              paramRtx.moveTo(paramNode.getDataKey());
              while (((ITreeStructData)paramRtx.getNode()).hasParent()) {
                  paramRtx.moveTo(paramRtx.getNode().getParentKey());
                  mIsInSubtree.set(paramRtx.getNode(), paramNode, true);
              }
          }
      }
docs: For each anchestor of n: n is in it's subtree.
  
  @param paramNode
  node in subtree
  @param paramRtx
  {@link IReadTransaction} reference
  @throws TTIOException