[breischl]

I think the point is that the data structure implies that there must be some operations to create and examine it. If there is no operation to create it, how did it come to exist? If there is no operation to examine it, then how do you know it's there at all? To go all Zen koan on it: if a data structure cannot be examined or changed, then is it really there at all?

That said I don't think that any particular set of operations is implied. A data structure will be more suitable for some operations than others, but it won't really require anything in particular.