FHIR Cross-Version Extensions package for FHIR R4 from FHIR R5
0.0.1-snapshot-2 - informative International flag

FHIR Cross-Version Extensions package for FHIR R4 from FHIR R5 - Version 0.0.1-snapshot-2. See the Directory of published versions

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Official URL: http://hl7.org/fhir/5.0/ImplementationGuide/hl7.fhir.uv.xver-r5.r4 Version: 0.0.1-snapshot-2
IG Standards status: Informative Maturity Level: 0 Computable Name: Hl7_fhir_uv_xver_r5_r4

The Cross-Version Extensions for FHIR (XVer) project provides a set of packages that define extensions, profiles, and value sets for cross-version compatibility in FHIR. These packages are designed to support the validation and interoperability of FHIR resources across different versions.

About This Guide

Cross-version extension content is generated via a combination of automatic differential detection and manual editing.

For details or questions, please reach out on Zulip or to the FHIR Infrastructure WorkGroup.

Goals

  • Ability to use elements from another version of FHIR
  • Encode information added in a newer version of FHIR
    • Community identified additional data that is needed
    • Need to provide a consistent way of representing it in an earlier version of FHIR
  • Encode information removed in a newer version of FHIR
    • Community decided data was no longer necessary
    • Need to provide a consistent way of representing it in a later version of FHIR
      • Version migration requires interoperability between versions and cannot break old expectations
      • Scenarios where data needs to round-trip conversion between different versions

Known Limitations

  • Not 100% coverage of all elements in all versions
    • Resource type elements are excluded (e.g., R5:Bundle.issues)
  • Mappings are generally between adjacent versions, so “back-and-forth” conversions may be needlessly verbose
  • Large / infinite value sets (e.g., UCUM, LOINC, MIME) are excluded and assumed ‘equivalent’ across versions

Intellectual Property Statements

This publication includes IP covered under the following statements.