docs: public void changed( ChangeSet changes ) {
          checkNotClosed();
          if (LOGGER.isTraceEnabled()) {
              LOGGER.trace("Cache for workspace '{0}' received {1} changes from local sessions: {2}", workspaceName,
                           changes.size(), changes);
          }
          // Clear this workspace's cached nodes (iteratively is okay since it's a ConcurrentMap) ...
          for (NodeKey key : changes.changedNodes()) {
              if (closed) break;
              nodesByKey.remove(key);
          }
  
          // Send the changes to the change bus so that others can see them ...
          if (changeBus != null) changeBus.notify(changes);
      }