UML25 — Location: 18.1.3 Semantics Use Cases and Actors P. 686 - Clarification meaning of not part of the subject

current text: “An Actor models a type of role played by an entity that interacts with the subjects of its associated UseCases (e.g., by exchanging signals and data), but which is external in the sense that an instance of an Actor is not a part of the instance of a subject of an associated UseCase. “

[AC] In my opinion, this is ambiguous, and could be replaced with “in the sense that, in a specific modeling context, an instance of the Actor is not a part of the instance of the subject of an associated UseCase”.

The offending sentence is unclear, and the concept of “external” is vague and dubious. Better clarity can be
achieved by removing it altogether.