UPDM — 8.3.18.3 Description

Specification is the ancestor of all the stereotypes that extend Instance Specification. It implements the common attribute,
description.
In general, any of the classes supplied in the class library as the type for instance specifications can be extended to
include additional attributes to be used in custom instance specifications.
Instances are created from classes that are defined in the UPDM ModelLibrary. The values of the attributes of the parent
class are set in the slots of the instance. Associations among instances of classes that reside in the Model Library are
specified by creating a link that is an instance of an association that is defined on the classes in the Model Library. In
addition, the stereotyped instance may have stereotype properties that define relationships to other stereotyped classes."

There is no description attribute.
It is not clear why this stereotype exists and how it should be used.