fixup! media-types: Define layer media types with and without '+gzip'

Author: wking

layer.md

@@ -4,7 +4,12 @@ This document describes how to serialize a filesystem and filesystem changes lik
 One or more layers are applied on top of each other to create a complete filesystem.
 This document will use a concrete example to illustrate how to create and consume these filesystem layers.
 
-This section defines the `application/vnd.oci.image.layer.v1.tar` and `application/vnd.oci.image.layer.nondistributable.v1.tar` [media types](media-types.md).
+This section defines the `application/vnd.oci.image.layer.v1.tar`, `application/vnd.oci.image.layer.v1.tar+gzip`, `application/vnd.oci.image.layer.nondistributable.v1.tar`, and `application/vnd.oci.image.layer.nondistributable.v1.tar+gzip` [media types](media-types.md).
+
+## `+gzip` Media Types
+
+The media type `application/vnd.oci.image.layer.v1.tar+gzip` represents an `application/vnd.oci.image.layer.v1.tar` payload which has been compressed with [gzip][rfc1952].
+The media type `application/vnd.oci.image.layer.nondistributable.v1.tar+gzip` represents an `application/vnd.oci.image.layer.nondistributable.v1.tar` payload which has been compressed with [gzip][rfc1952].
 
 ## Distributable Format
 
@@ -318,4 +323,5 @@ Implementations SHOULD NOT upload layers tagged with this media type; however, s
 
 [libarchive-tar]: https://github.com/libarchive/libarchive/wiki/ManPageTar5#POSIX_ustar_Archives
 [gnu-tar-standard]: http://www.gnu.org/software/tar/manual/html_node/Standard.html
+[rfc1952]: https://tools.ietf.org/html/rfc1952
 [tar-archive]: https://en.wikipedia.org/wiki/Tar_(computing)

manifest.md

@@ -55,9 +55,9 @@ Unlike the [Manifest List](manifest-list.md), which contains information about a
         Implementations MUST support at least the following media types:
 
         - [`application/vnd.oci.image.layer.v1.tar`](layer.md)
-        - [`application/vnd.oci.image.layer.v1.tar+gzip`](media-types.md#oci-image-media-types)
+        - [`application/vnd.oci.image.layer.v1.tar+gzip`](layer.md#gzip-media-types)
         - [`application/vnd.oci.image.layer.nondistributable.v1.tar`](layer.md#non-distributable-layers)
-        - [`application/vnd.oci.image.layer.nondistributable.v1.tar+gzip`](media-types.md#oci-image-media-types)
+        - [`application/vnd.oci.image.layer.nondistributable.v1.tar+gzip`](layer.md#gzip-media-types)
 
         Manifests concerned with portability SHOULD use one of the above media types.
 

media-types.md

@@ -7,9 +7,9 @@ The following media types identify the formats described here and their referenc
 - `application/vnd.oci.image.manifest.v1+json`: [Image manifest](manifest.md#image-manifest)
 - `application/vnd.oci.image.config.v1+json`: [Image config](config.md)
 - `application/vnd.oci.image.layer.v1.tar`: ["Layer", as a tar archive](layer.md)
-- `application/vnd.oci.image.layer.v1.tar+gzip`: ["Layer", as a tar archive](layer.md) compressed with [gzip][rfc1952]
+- `application/vnd.oci.image.layer.v1.tar+gzip`: ["Layer", as a tar archive](layer.md#gzip-media-types) compressed with [gzip][rfc1952]
 - `application/vnd.oci.image.layer.nondistributable.v1.tar`: ["Layer", as a tar archive with distribution restrictions](layer.md#non-distributable-layers)
-- `application/vnd.oci.image.layer.nondistributable.v1.tar+gzip`: ["Layer", as a tar archive with distribution restrictions](layer.md#non-distributable-layers) compressed with [gzip][rfc1952]
+- `application/vnd.oci.image.layer.nondistributable.v1.tar+gzip`: ["Layer", as a tar archive with distribution restrictions](layer.md#gzip-media-types) compressed with [gzip][rfc1952]
 
 ## Media Type Conflicts