Each subschema subentry holds an operational attribute called governing subentry, whose value is its own distinguished name.
Scroll down the Extended Query Form until you find the section marked, reference subentry fields.
Each access control subentry below these administrative points is then checked to see if the entry is included within scope of the subtree specification.
The subentry object class is a structural object class which is a subclass of top.
A subentry name form is also defined, which dictates that subentries shall be named with the common name attribute type.