OSF DCE Administration Guide--Core Components

Creating and Using Extended Registry Attributes
Each attribute set is attached to an object and, although the system does not enforce it,
each attribute that is a member of a set should also be attached to the same object.
Attribute sets cannot be nested; a member of an attribute set cannot itself be an
attribute set.
To create, modify, and delete members in an attribute set, follow the instructions to
create, modify, and delete mutli-valued attributes. The attribute instances that are
members of the set are identified by UUIDs.
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