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fhir-codegen

A .Net application, library, and related utilities to work with FHIR specifications.

Documentation

Detailed documentation can be found on the documentation site.

Projects in this Repository

Project source code is hosted on GitHub.

All projects are currently built on .Net 8.0 and tested on multiple platforms, though Windows is the primary development platform. The .Net 8.0 SDK and runtimes are available for free at: https://dotnet.microsoft.com/en-us/download .

Microsoft.Health.Fhir.CodeGenCommon

This project is a class library that contains the common (normalized) models used in these projects. The project is lightweight with minimal dependencies and used to ensure that additional projects and external development have access to models.

Detailed information about the models can be found in the Common Models Documentation.

Microsoft.Health.Fhir.CrossVersion

This project is a class library that provides basic support for loading specifications from multiple versions of FHIR. The library is scoped to the needs of this project and is not intended to be a full FHIR library. It is incomplete in support, though we do plan on expanding in the future.

Microsoft.Health.Fhir.MappingLanguage

This project is a class library that provides support for working with the FHIR Mapping Language (FML). Today, content is focused on parsing FML and providing useful abstractions for consumption.

Microsoft.Health.Fhir.CodeGen

This project is a class library that contains the logic used to process FHIR specifications. For example, this project contains the code to:

  • download packages,
  • resolve canonical URLs,
  • normalize different versions of FHIR,
  • read metadata (CapabilityStatement or Conformance) from FHIR servers,
  • compare packages or artifacts,
  • convert normalized models into language-specific models,
  • etc.

More information about this project can be found in the API Documentation.

Export Languages

The projects in this repository can be used to translate FHIR packages (core or IG) into other forms - e.g., programming language definitions (C#, TypeScript, Ruby, etc.), other language definitions (FHIR Shorthand, OpenAPI, etc.), or data formats (Info text, etc.).

More information about current languages can be found on the Export Languages Page. Information about adding new languages can be found on the Extending Page.

fhir-codegen

This project is a command-line application that can be used to perform export operations (e.g., for CI Pipelines). Generally, it can:

  • manage the FHIR Package Cache (~/.fhir) - add/update packages
  • perform exports / transforms of FHIR packages
  • compare specification packages

To run this project from a command line:

  • dotnet run --project src/fhir-codegen-cli/fhir-codegen-cli.csproj -- [command] [options] or you can build a release version to run:
  • dotnet build -c Release
  • ./src/fhir-codegen/bin/Release/net8.0/fhir-codegen-cli.exe
Description:
  A utility for processing FHIR packages into other formats/languages.

Usage:
  fhir-codegen [command] [options]

Options:
  --fhir-cache <fhir-cache>                                           Location of the FHIR cache (none specified defaults to user .fhir directory). []
  --use-official-registries                                           Use official FHIR registries to resolve packages. []
  --additional-fhir-registry-urls <additional-fhir-registry-urls>     Additional FHIR registry URLs to use. []
  --additional-npm-registry-urls <additional-npm-registry-urls>       Additional NPM registry URLs to use. []
  --output-dir, --output-directory, --output-path <output-directory>  File or directory to write output. []
  --output-filename <output-filename>                                 Filename to write output. []
  -p, --load-package, --package <load-package>                        Package to load, either as directive ([name]#[version/literal]) or URL. []
  --auto-load-expansions                                              When loading core packages, load the expansions packages automatically. []
  --resolve-dependencies                                              Resolve package dependencies. []
  --load-structures                                                   Types of FHIR structures to load. []
    opt: CapabilityStatement
    opt: CodeSystem
    opt: Compartment
    opt: ComplexType
    opt: ConceptMap
    opt: Extension
    opt: ImplementationGuide
    opt: Interface
    opt: LogicalModel
    opt: NamingSystem
    opt: Operation
    opt: PrimitiveType
    opt: Profile
    opt: Resource
    opt: SearchParameter
    opt: StructureMap
    opt: Unknown
    opt: ValueSet

  --export-keys <export-keys>                                         Keys of FHIR structures to export (e.g., Patient), empty means all. []
  --load-canonical-examples                                           Load canonical examples from packages. []
  --offline                                                           Offline mode (will not download missing packages). []
  --fhir-version <fhir-version>                                       FHIR version to use. []
  --version                                                           Show version information
  -?, -h, --help                                                      Show help and usage information

Commands:
  generate     Generate output from a FHIR package and exit.
  compare      Compare two sets of packages.
  gui          Launch the GUI (experimental).

More information about this project can be found in the Command Line Documentation.

Examples

  • Download and parse FHIR R4 (latest published version) into the user FHIR cache, then build a TypeScript file in the current directory

    • fhir-codegen generate TypeScript -p hl7.fhir.r4.core --output-path ./R4.ts

  • Download and parse FHIR R4 (latest published version) into the user FHIR cache, then build a TypeScript file in the current directory, restricted to just the Resources: Patient, Encounter, and Observation

    • fhir-codegen generate TypeScript -p hl7.fhir.r4.core --output-path ./R4.ts --export-keys Patient|Encounter|Observation

  • Download and parse FHIR R4 (latest published version) into the user FHIR cache, reach out the Firely Test Server, and build a set of OpenAPI definitions

    • generate OpenApi --fhir-server-url http://server.fire.ly/r4 -p hl7.fhir.r4.core#4.0.1 --output-path ./FS-OpenApi-R4 --include-experimental --schema-level names --metadata true --multi-file true --single-responses false --resolve-server-canonicals false --resolve-external-canonicals false --basic-scopes-only true

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks

FHIR® is the registered trademark of HL7 and is used under Community Project guidelines. This project is not affiliated with, or approved or sponsored by, HL7.