In short I think the answer is yes, that collections such as generated by
queries can be parts of DO collections.
I would go back to Reagan Moore's early observation (to effect if I
understand right) that " "Digital collections implement arrangement by a
community for organizing their digital entities.."
They are then aggregations of interest defined by communities.
Now this ultra flexibility may, I have a sense of worry without having
figured this out, overload the role of digital object since it seems to