-The tool that implements a step can in turn be a workflow (*nested workflow* or *subworkflow*): in this case, it MUST be represented as a `ComputationalWorkflow`, and all of the above directions apply to it recursively. If the subworkflow is described in a section of the main workflow (e.g. as in [packed CWL workflows](https://www.commonwl.org/v1.2/CommandLineTool.html#Packed_documents)), rather than in a file of its own, it SHOULD be added to the crate as a [contextual entity](https://www.researchobject.org/ro-crate/1.1/contextual-entities.html): in this case, its type list MUST NOT include `File`.
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