=== Field specifications and limitations ===
@TBD: Do we want a possibility to specify which fields should be return on a GET request? This could either be used to save further requests to element URIs, if one fetches items from a collection URL, or to reduce the required amount of data to be transferred if one only uses a few attributes from a response. If yes, a <code>fields</code> query parameter should be added to a resource which takes a comma separated list of field names, such as <code>https://api.example.com/v1/users?fields=firstname,lastname</code>.
=== Input validations ===