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Clarify that subject references a separate DAG #1160

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Jan 26, 2024
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Clarify that subject references a separate DAG #1160

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13 changes: 7 additions & 6 deletions image-index.md
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Expand Up @@ -93,7 +93,7 @@ For the media type(s) that this document is compatible with, see the [matrix][ma
- **`subject`** *[descriptor](descriptor.md)*

This OPTIONAL property specifies a [descriptor](descriptor.md) of another manifest.
This value, used by the [`referrers` API][referrers-api], indicates a relationship to the specified manifest.
This value defines a weak association to a separate [Merkle Directed Acyclic Graph (DAG)][dag] structure, and is used by the [`referrers` API][referrers-api] to include this manifest in the list of responses for the subject digest.

- **`annotations`** *string-string map*

Expand Down Expand Up @@ -179,9 +179,10 @@ When the variant of the CPU is not listed in the table, values are implementatio
}
```

[dag]: https://en.wikipedia.org/wiki/Merkle_tree
[go-environment2]: https://golang.org/doc/install/source#environment
[iana]: https://www.iana.org/assignments/media-types/media-types.xhtml
[matrix]: media-types.md#compatibility-matrix
[referrers-api]: https://github.com/opencontainers/distribution-spec/blob/main/spec.md#listing-referrers
[rfc6838]: https://tools.ietf.org/html/rfc6838
[rfc6838-s4.2]: https://tools.ietf.org/html/rfc6838#section-4.2
[iana]: https://www.iana.org/assignments/media-types/media-types.xhtml
[matrix]: media-types.md#compatibility-matrix
[referrers-api]: https://github.com/opencontainers/distribution-spec/blob/main/spec.md#listing-referrers
[rfc6838]: https://tools.ietf.org/html/rfc6838
[rfc6838-s4.2]: https://tools.ietf.org/html/rfc6838#section-4.2
10 changes: 6 additions & 4 deletions manifest.md
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Expand Up @@ -94,7 +94,7 @@ Unlike the [image index](image-index.md), which contains information about a set
- **`subject`** *[descriptor](descriptor.md)*

This OPTIONAL property specifies a [descriptor](descriptor.md) of another manifest.
This value, used by the [`referrers` API](https://github.com/opencontainers/distribution-spec/blob/main/spec.md#listing-referrers), indicates a relationship to the specified manifest.
This value defines a weak association to a separate [Merkle Directed Acyclic Graph (DAG)][dag] structure, and is used by the [`referrers` API][referrers-api] to include this manifest in the list of responses for the subject digest.

- **`annotations`** *string-string map*

Expand Down Expand Up @@ -257,6 +257,8 @@ The decision tree below and the associated examples MAY be used to design new ar

_Implementers note:_ artifacts have historically been created without an `artifactType` field, and tooling to work with artifacts should fallback to the `config.mediaType` value.

[iana]: https://www.iana.org/assignments/media-types/media-types.xhtml
[rfc6838]: https://tools.ietf.org/html/rfc6838
[rfc6838-s4.2]: https://tools.ietf.org/html/rfc6838#section-4.2
[dag]: https://en.wikipedia.org/wiki/Merkle_tree
[iana]: https://www.iana.org/assignments/media-types/media-types.xhtml
[referrers-api]: https://github.com/opencontainers/distribution-spec/blob/main/spec.md#listing-referrers
[rfc6838]: https://tools.ietf.org/html/rfc6838
[rfc6838-s4.2]: https://tools.ietf.org/html/rfc6838#section-4.2