{
  "resourceType": "NamingSystem",
  "id": "HrmContentChecksumNS",
  "name": "HrmContentChecksum",
  "status": "draft",
  "kind": "identifier",
  "date": "2026-09-04",
  "publisher": "WELLSTAR Technologies Corp.",
  "responsible": "Nexus EMR (WELL Health) -- content digest of a report ingested from HRM",
  "description": "A content digest of a report ingested from Health Report Manager, carried on DiagnosticReport.identifier. THE VALUE IS COMPUTED, NOT ISSUED: it is a SHA-256, lower-case hexadecimal, over the bytes of the first presentedForm attachment -- the report content, UTF-8 encoded where the message carried text and verbatim where it carried a binary document -- taken before the original message file is attached as a second presentedForm entry, so it covers the report and not the delivery envelope. Two unrelated reports with byte-identical content carry the same value, so it MUST NOT be used as a business identifier, a reference target, or a match key between systems. WHAT IT IS FOR: distinguishing a re-send from a revision once a report has already been matched on its other identifiers. IT IS NOT AN INTEGRITY GUARANTEE -- nothing re-verifies it against the attachment after ingest, so neither a match nor a mismatch is evidence about authenticity; Attachment.hash is the element for that question. MIGRATION: Nexus EMR writes this system today as http://services.well.com/fhir/identifier/hrm-content-checksum (FHIR-372), an address this specification does not publish; it is live in stored Identifier.system values and in code, and is under migration to the URI declared here. Write the URI declared here; expect both until the migration completes.",
  "uniqueId": [
    {
      "type": "uri",
      "value": "https://fhir.apps.health/NamingSystem/hrm-content-checksum",
      "preferred": true,
      "comment": "The canonical address this specification declares. Author against this one. The writer has not moved yet, so a reader must also match the address below."
    },
    {
      "type": "uri",
      "value": "http://services.well.com/fhir/identifier/hrm-content-checksum",
      "preferred": false,
      "comment": "The pre-migration address. It is live in stored `Identifier.system` values and in code, and is under migration to the preferred URI above. Match it literally when reading; do not write it."
    }
  ]
}