FhirEvaluationContext.TerminologyService should be of type ICodeValidationTerminologyService

[marcovisserFurore]

In the current implementation, the terminology service defined within the FhirEvaluationContext class is of the type ITerminologyService, which is overly broad for our specific needs. Our sole requirement within FhirPath is to utilize the ValueSetValidateCode() method. Therefore, it would be more appropriate to reconfigure FhirEvaluationContext.TerminologyService to be of the type ICodeValidationTerminologyService to align with our focused functionality.

[alexzautke]

Our sole requirement within FhirPath is to utilize the ValueSetValidateCode() method.

That is until some ImplementationGuide requires the usage the subsumes FHIRPath operation. It took some years until users wanted to have memberOf, so it’s unlikely but at least it’s defined.