Sheaf · fuchsia · Fuchsia OS — fuchsia.io

A node may have multiple supported representations when opening, even though it may have a fixed underlying identity. Today, a file is accessed via the [`File`] protocol, and sends a [`Representation.FileInfo`] when opened with `GET_REPRESENTATION`. However, in the future we might introduce a more sophisticated `FileV2` protocol, or a more efficient `SuperFastFile` backed by a specialized kernel object. New clients can request the more advanced representations by specifying the corresponding bits in [`NodeProtocolKinds`], whereas existing clients would continue to talk to the node via the old representation. [`NodeProtocolKinds`] enables forward-compatibility through a form of protocol negotiation. The elements have one-to-one correspondence with the members of [`Representation`].