I'm trying to run the

medplum-patient-intake-demo

and I'm receiving an error when clicking on the "Languages Spoken" input field: > CodeSystem urn:ietf:bcp:47 not found There does exist a

ValueSet

in my system for "http://hl7.org/fhir/ValueSet/languages". All the language entries are there, and each has a: -

code

-

display

-

designation

This

ValueSet

references a

CodeSystem

(I assume) called "urn:ietf:bcp:47", which does not exist in my system. My questions: 1. Is this demo not meant to work out-of-the-box? In other words, why is the required

CodeSystem

missing? (Or maybe my database is stale and this is a newer demo?) 2. Why is it a requirement to create a corresponding

CodeSystem

when the entries are going to be identical to the

ValueSet

entries (i.e.

code

,

display

,

designation

)? Isn't this redundant data? Edit: An additional question: 3. Why do some `ValueSet`s (i.e. https://hl7.org/fhir/valueset-languages.html) specify a CLD/Content Logical Definition and no Expansion (which seems to require a backing

CodeSystem

, and some `ValueSet`s (e.g. http://hl7.org/fhir/us/core/ValueSet/us-core-usps-state) specify an Expansion with no CLD (which seems to work without a backing

CodeSystem

)?

Hey @Zira - First, this is definitely a bug, the demo should work. Thank you for flagging. I think what happened was this: 1. Once upon a time, the Medplum terminology services silently allowed

ValueSet/$expand

if the corresponding

CodeSystem

was missing, and it would simply use the embedded codes. That was not technically correct, but it was often what people expected. 2. We wrote the

medplum-patient-intake-demo

based on that behavior 3. We subsequently implemented a more strict

CodeSystem

requirement 4. The demo is broken 😿 The obvious fix for us is to add a

urn:ietf:bcp:47

CodeSystem

resource with those values. We can do that asap. Separately, I thought that we had explored adding a fallback to the old behavior where we would silently ignore the missing

CodeSystem

, and would then support the incorrect "just use the `ValueSet`" model. Let me check with the team on that.

@cody Thanks so much for the thoughtful response! Got it. In the meantime I've used the

CodeSystem/$import

endpoint to import the coding from the http://hl7.org/fhir/ValueSet/languages

ValueSet

and it seems to be working. 🙂