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image-layout: add explanation of the refs directory use case for tags #225

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Aug 31, 2016
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5 changes: 5 additions & 0 deletions image-layout.md
Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,11 @@ No semantic restriction is given for object names in the `refs` subdirectory.
Each object in the `refs` subdirectory MUST be of type `application/vnd.oci.descriptor.v1+json`.
In general the `mediatype` of this [descriptor][descriptors] object will be either `application/vnd.oci.image.manifest.list.v1+json` or `application/vnd.oci.image.manifest.v1+json` although future versions of the spec MAY use a different mediatype.

**Implementor's Note:**
A common use case of refs is representing "tags" for a container image.
For example, an image may have a tag for different versions or builds of the software.
In the wild you often see "tags" like "v1.0.0-vendor.0", "2.0.0-debug", etc.

This illustrates the expected contents of a given ref, the manifest list it points to and the blobs the manifest references.

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