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  1. FHIR Specification Feedback
  2. FHIR-36755

Forward / Backward Compatibility Rules - Clarify Warning Constraints are Allowed

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    • Icon: Change Request Change Request
    • Resolution: Persuasive with Modification
    • Icon: Medium Medium
    • FHIR Core (FHIR)
    • R4
    • FHIR Infrastructure
    • Change Management & Versioning (versions/compatibility)
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      Will change:

      "The allowed list of Data types will not be added, removed or changed. Invariants, regular expressions, fixed values and patterns will not be added, removed or changed."

      to

      "The allowed list of Data types will not be added, removed or changed. Invariants, regular expressions, fixed values and patterns will not be added, removed or changed in a way that could invalidate previous instances.  New warning or best practice invariants may be added. 'Error' invariants may be added that are tied to newly introduced elements or codes."

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      Will change: "The allowed list of Data types will not be added, removed or changed. Invariants, regular expressions, fixed values and patterns will not be added, removed or changed." to "The allowed list of Data types will not be added, removed or changed. Invariants, regular expressions, fixed values and patterns will not be added, removed or changed in a way that could invalidate previous instances.  New warning or best practice invariants may be added. 'Error' invariants may be added that are tied to newly introduced elements or codes."
    • Rick Geimer/Richard Ettema: 20-0-1
    • Correction
    • Compatible, substantive
    • R5

    Description

      The text here:  http://hl7.org/fhir/versions.html#maturity  indicates that constraints cannot be added to a normative resource.  

      Category Value Constraints: The allowed list of Data types will not be added, removed or changed. Invariants, regular expressions, fixed values and patterns will not be added, removed or changed.

      Please update the text to clarify that warning constraints/invariants do not impact forward or backward compatibility or qualify that the statements above are specific to error constraints/invariants.

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            GrahameGrieve Grahame Grieve
            carmela_couderc Carmela A. Couderc
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              Updated:
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