code: public Tree getDescriptor(String nodeID) {
  		if (this.nodeID.equals(nodeID)) {
  			return registry.getDescriptor();
  		}
  		NodeDescriptor node = nodes.get(nodeID);
  		if (node == null) {
  			return null;
  		}
  		Tree info = null;
  		node.readLock.lock();
  		try {
  			if (node.info != null) {
  				info = node.info.clone();
  			}
  		} finally {
  			node.readLock.unlock();
  		}
  		return info;
  	}
docs: --- GET DESCRIPTOR OF A NODE ---