X-NDS_CONTAINMENT is an ObjectClass Extended Flags and one of the EDirectory Extended LDAP Flags

When included, this flag is followed by a list of object classes that can be the parent container of the object class that is being defined. This is an LDAP method to expose the Edirectory Containment Rules

When not included, the object class that is being defined is automatically assigned containment classes of country, organization, organizationalUnit, locality, and domain.

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