https://github.com/s-urbaniak/image-spec/blob/master/serialization.md#combined-image-json--filesystem-changeset-format specifies a couple of files, none of which have any media types defined:

• VERSION (plain text file) schema version of the following json file
• json (json file), pointing to a "version 1" metadata format of the, which show 404.
• repositories (json file)
• layer.tar (layer tar file)
• manifest.json (json file) (is this the "combined Image JSON"?)

It is not clear to me how this relates to the Image Manifest file (https://github.com/s-urbaniak/image-spec/blob/master/manifest.md#image-manifest) and how we can reference a combined image from the "Image Manifest".

Also it is unclear to which of the above files the specified application/vnd.oci.image.serialization.combined.v1+json media type points to, the +json indicates a JSON format, is it manifest.json?