[kevan]

This is just the data serialization format, you have to build any other functionality yourself. We do have a pattern on a few of our APIs where there's a big fixed schema (i.e. it's just a struct and you can't do GraphQL things like following references and hydrating them into objects) and clients select the subset of attributes they want and we only return that. It's useful for reducing response sizes but the main benefit is we can pretty easily track which attributes are actually used over time. That helps us deprecate attributes with a lot less pain.