Implementations that are reading/processing [manifests](manifest.md) or [image indexes](image-index.md) MUST NOT generate an error if they encounter an unknown property.
* OCI Images are [content-addressable](https://en.wikipedia.org/wiki/Content-addressable_storage). See [descriptors](descriptor.md) for more.
* One benefit of content-addressable storage is easy deduplication.
* Many images might depend on a particular [layer](layer.md), but there will only be one blob in the [store](image-layout.md).
* With a different serialization, that same semantic layer would have a different hash, and if both versions of the layer are referenced there will be two blobs with the same semantic content.
* To allow efficient storage, implementations serializing content for blobs SHOULD use a canonical serialization.
* This increases the chance that different implementations can push the same semantic content to the store without creating redundant blobs.
