metasection of a resource slice is structured similarly to the
resourcessection: it is an object, and each of its keys is a resource ID.
meta. You can put anything that you would like here. Typically, the information that you store within
metaare the things that are useful for the client-side application, but that don't need to be sent to the server.
selected, associated with two resources. This value could represent that a user has "selected" these resources in the UI.