I think the ambiguity comes from the fact that a manifest, when modelled as a class, es a singleton.
So it really doesn't matter where the methods are; they will work. If this where modelled properly, a single class which would hold the Package data, then we would have only one class (Package) and several instances, each with its own variables: author, comment, creationDate, etc. So for now, maybe it's irrelevant the distinction. Because where the methods are do not really reflect anything on the reality we are modelling.
