Support multiple FHIR versions as a Client

Sid · February 13, 2020, 10:27am

Hi,
We, as a client, are looking to consume FHIR resources to get FHIR data. We are looking to build a solution that supports multiple versions of FHIR such as DSTU2, STU3 and R4 using .NET platform.

Are there any .NET libraries or packages in the market that could help us achieve this? Or has anyone implemented a custom solution to support multiple versions?
Also, is there a version converter that lets us convert from one version to another?

Any input (irrespective of the language) or help is greatly appreciated.

blessed_tabvirwa1 · February 13, 2020, 4:32pm

Hi Sid,

There are some examples of implementations here, https://wiki.hl7.org/Open_Source_FHIR_implementations

Hope that helps?

brian_pos · March 7, 2020, 10:24am

Handling multiple version isn’t too hard.
Take a look at the fhirpathtester code on github. To see how to do it.

github.com

brianpos/FhirPathTester/blob/b6433d4e611608ed8dba60b64736bc86eafb84b8/UWP/FhirPathTesterUWP.csproj#L287


  <PackageReference Include="Microsoft.Toolkit.Uwp.UI.Controls">
    <Version>5.1.1</Version>
  </PackageReference>
  <PackageReference Include="Phonix">
    <Version>1.0.1</Version>
  </PackageReference>
  <PackageReference Include="Porter2Stemmer">
    <Version>1.0.0</Version>
  </PackageReference>
</ItemGroup>
<Target Name="ChangeAliasesOfStrongNameAssemblies" BeforeTargets="FindReferenceAssembliesForReferences;ResolveReferences">
  <ItemGroup>
    <ReferencePath Condition="'%(FileName)' == 'Hl7.Fhir.DSTU2.Core'">
      <Aliases>dstu2</Aliases>
    </ReferencePath>
  </ItemGroup>
  <ItemGroup>
    <ReferencePath Condition="'%(FileName)' == 'Hl7.Fhir.STU3.Core'">
      <Aliases>stu3</Aliases>
    </ReferencePath>
  </ItemGroup>

This is the key part for it.
And a file in there that uses multiple versions at the same time

github.com

brianpos/FhirPathTester/blob/b6433d4e611608ed8dba60b64736bc86eafb84b8/WPF/FhirPathProcessor.cs#L3


extern alias dstu2;
extern alias stu3;
extern alias r4;


using Hl7.Fhir.ElementModel;


using fp2 = dstu2.Hl7.Fhir.FhirPath;
using f2 = dstu2.Hl7.Fhir.Model;


using fp3 = stu3.Hl7.Fhir.FhirPath;
using f3 = stu3.Hl7.Fhir.Model;


using fp4 = r4.Hl7.Fhir.FhirPath;