XDS SubmissionSet SourceID

Am wondering whether anyone is aware of suggested mapping for XDS SubmissionSet sourceId to FHIR DocumentReference?

We’re currently considering meta.source but haven’t managed to find anything online that confirms. Has anyone encountered implementations that support this assumption, or is there a better place in the DocumentReference resource for the XDS SubmissionSet sourceId?

See the IHE implementation guide for using FHIR as a method of interfacing with XDS – IHE.MHD.FHIR\MHD Home - FHIR v4.0.1

The SubmissionSet does not map to DocumentReference.

The DocumentEntry maps to a DocumentReference
The SubmissionSet maps to a kind of List
The Folder maps to a different kind of List

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