The alignment criticism was a bit confused, agreed. Pondering this a bit further, I think my question boils down to this: in a more RDF-y, less datastream-y Fedora 4 world, is it still meaningful (or *how* is it still meaningful) to indicate "whereness" of metadata assertions?

In the following two statements:

```ruby
has_metadata 'descMetadata', type: MyMetadata
has_attributes :title, datastream: 'descMetadata'
```

what will the role of the string `descMetadata` be?

This is definitely beyond the scope of this PR, FWIW, and perhaps worthy of a discussion at Hydra Connect.