Navigating the tree
n X.500 also added the concept that a sub-arc
might be identified by a pair of values (for
example, organisational unit and location),
rather than just by a single value.
n This is the principal difference (apart from
character v binary representation) between
the X.500 use of the RH-name tree concept
and the ASN.1 use of the RH-name tree
concept for the Object Identifier tree.