Return subtree depth of this name for purposes of determining
NameConstraints minimum and maximum bounds and for calculating
path lengths in name subtrees.
@returns distance of name from root
@throws UnsupportedOperationException if not supported for this name type
Return subtree depth of this name for purposes of determining NameConstraints minimum and maximum bounds and for calculating path lengths in name subtrees.
@returns distance of name from root @throws UnsupportedOperationException if not supported for this name type