code: protected void addContainerTags() {
  	// Only add root if we aren't it
  	final RootContainer rc = getRootContainer(container);
  	if (rc != null) {
  	    tags.add(rc);
  	}
  
  	final TreeDepth parentDepth = getTreeDepth(container);
  	tags.add(parentDepth != null ? parentDepth.increment() : TreeDepth.ROOT);
      }
docs: Adds tree based tags for when a non-null container is set.
  
  @see RootContainer
  @see TreeDepth