Add support for validation of FHIR resources

[ndegwamartin]

Overview We can explore adding validation support to the FHIR Core Tooling by making use of HAPI FHIR resource validation strategies here.

This type of validation will ensure resources for example that are extracted via structure maps conform to the basic FHIR validation rules. Note, the validation here is outside of the IG/Profiles validation. This can be added in a future iteration.

Also note, an official HAPI FHIR validator exists but we also want to add similar support to efsity for eventual integration to CI https://confluence.hl7.org/display/FHIR/Using+the+FHIR+Validator

Implementation spec.

1. Add a new sub command validateFhir to efsity.

Sample commands :

fct validateFhir -i /path/to/resources/file/or/folder  

Input

• The FHIR Resource that requires validation. Path could be a folder with resources or a specific resource file path. Note the user may have different files in that specific folder so implementation should handle that.
• Flag is -i and --input as an alias

Output

• If the resource (or all resources) pass validation then a success message on the STD OUT.
• If any resource fails then an error message and the corresponding file path of resource that failed validation

Documentation

• Add command documentation to the READ ME

Future Extensions

• Validations via Implementation Guides/Profiles

Resources:

• https://hapifhir.io/hapi-fhir/docs/validation/introduction.html
• https://hapifhir.io/hapi-fhir/docs/validation/instance_validator.html
• https://www.linkedin.com/pulse/validate-fhir-resource-against-ig-profile-srinivas-velamuri
• https://confluence.hl7.org/display/FHIR/Using+the+FHIR+Validator

[pld]

can we import the underlying HAPI validator library and call it more or less directly?

[ndegwamartin]

can we import the underlying HAPI validator library and call it more or less directly?

we should already have the required classes available via the HAPI FHIR library e.g. the Instance Validator sample here https://hapifhir.io/hapi-fhir/docs/validation/instance_validator.html