Stream: dotnet
Topic: Message definitions with firely-net-sdk
Pash (Mar 11 2021 at 09:26):
Hi everyone.
I need to validate the incoming message and have public message definitions to restrict resources/codes etc by event type. Please advise how to create a message definition (well, probably creation is simple - just use models from the lib but anyway) and validate incoming messages using it with firely-net-sdk?
René Spronk (Mar 11 2021 at 09:29):
Defining a message structure (=profiling) isn't easy at all [if you're new to it], see http://build.fhir.org/conformance-module.html .. creating/parsing a message is easy, as is validation, using the ,net SDK, the definition of a profile is not.
Pash (Mar 11 2021 at 10:09):
@René Spronk I see. So starting from the easiest: just check if the message contains 1 Patient. Assume this definition is created: https://www.codepile.net/pile/kBLDjWB9 (in memory. By the way, please feel free to add notes there is something looks wrong), how to use it to check the message? I want to investigate how hard is to do it using the best practices and obviously dirty workaround here - validate it manually.
René Spronk (Mar 11 2021 at 10:17):
Validation strategies can be found here: http://build.fhir.org/validation.html - what approach you choose depends on your requirements
Pash (Mar 11 2021 at 11:06):
@René Spronk hm, I need only validation with MessageDefinition, don't need full profile validation (not sure if it possible, but it is also my question). So just need to check if Bundle with a specific event type (in the MessageHeader) has a set of resources (and additionally validate some properties in that resources, but lets start from an easier example ) and be able to publish that profiles as contracts for third parties. Any advice on how to do it with firely-net-sdk?
René Spronk (Mar 11 2021 at 11:08):
I'm not a .net SDK user myself, so I'll leave that to others to respond to.
Pash (Mar 11 2021 at 11:13):
@René Spronk np, thank you for help!
@Mirjam Baltus probably you can help with my stupid question?
Mirjam Baltus (Mar 11 2021 at 11:57):
@Pash Actually this is not a stupid question at all, but I also have to say that I do not know of a straightforward solution. I think you will have to code the validation by hand.
The MessageHeader of the message could contain a link to the MessageDefinition. With that, I would try to see if the MessageHeader.event[x] matches the one in the definition. Or, if it is not linked, I would try to find the relevant MessageDefinition by using a lookup on the event code in the MessageHeader. After that, I would run through the focus resources in the definition to see if they are listed in the message header, plus also perhaps do a check on the Bundle to see if they're included. But again, this would all be done by coding the important parts of my checks.
Pash (Mar 16 2021 at 21:17):
Trying to validate Resource using custom StructureDefinition. In MessageDefinition I have reference to custom StructureDefinition (where specified validation rules valid ONLY in the current context). How to validate resource by only 1 (and every time different) StructureDefinition? I see it is "InMemoryProfileResolver" in FHIR NET lib, but it is private. So I need to create profile resolvers and validators on a fly (not sure if it is a good solution). Any advice?
Pash (Mar 16 2021 at 21:46):
Should I create my own custom IResourceResolver?
Mirjam Baltus (Mar 23 2021 at 12:43):
@Pash You can point the validator to use a specific profile to validate against. Here's an example:
var source = new CachedResolver(new MultiResolver(new DirectorySource(@"MyProfileFolder",
new DirectorySourceSettings() { IncludeSubDirectories = true }),
ZipSource.CreateValidationSource()));
var ctx = new ValidationSettings
{
ResourceResolver = source,
GenerateSnapshot = true,
};
var validator = new Validator(ctx);
var result = validator.Validate(pat, @"http://hl7.org/fhir/us/core/StructureDefinition/us-core-patient");
My example just validates a Patient poco against the US Core Patient profile.
If you put all your custom profiles in the folder, you can expand the last line to validate against a specific profile depending on some determining value.
Jeena a (Mar 30 2021 at 15:44):
Hi,
I am using the .net firely library to validate my bundle resource and I get an error on the extenisons - {Text="Unable to resolve reference to profile 'http://XXX/patient-code'"} this is expected in my case as the extensions haven't been published yet. Is there a way to treat these as just warnings. and not error to be able to validate the bundle.
Marten Smits (Mar 31 2021 at 14:31):
See my answer here: https://github.com/FirelyTeam/firely-net-sdk/discussions/1675
Last updated: Apr 12 2022 at 19:14 UTC
