"An object or alias entry is characterized by precisely one
structural object class superclass chain which has a single
structural object class as the most subordinate object class.
This structural object class is referred to as the structural
object class of the entry."
There's a bit of ambiguity with this
"which has a single structural object class as the most subordinate
object class"
What do you mean by 'most subordinate'? Is it that there must be no
parallel entries at the same level in the hierarchy?