ASN.1consortium
Navigating the tree
nX.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.
nThis 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.