MIB roots can be defined relative to parent roots either contained or added to a MIB definition file. The example depicts the 802dot11 MIB defined relative to parents US, member, and fundamental base iso root "1".
iso OBJECT IDENTIFIER ::= { 1 } member OBJECT IDENTIFIER ::= { iso 2 } US OBJECT IDENTIFIER ::= { member 840 } ieee802dot11 MODULE-IDENTITY . . . ::= { US 10036 }
When defined relative to a parent root, all the parents are visually present in the tree.