Missing entity from workflow example, or spec needs clarifying.

[fbacall]

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Describe the bug The workflow RO crate example refers to { "@id": "README.md" } in its hasPart, but there is no entity with that @id in the @graph. Is this valid?

URL https://github.com/ResearchObject/ro-crate/blob/master/examples/workflow-0.2.0/ro-crate-metadata.jsonld#L79

Suggested fix Add an entity for the README file, or clarify in the spec that this is a valid scenario.

Additional context The spec mentions:

Where files and folders are represented as Data Entities in the RO-Crate JSON-LD, these MUST be linked to, either directly or indriectly, from the Root Data Entity using the hasPart property.

but it is not clear if the inverse is true.

[stain]

I think all the data entities in hasPart should also be represented in the @graph - do you agree @ptsefton ?