Details
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Change Request
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Resolution: Not Persuasive
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Medium
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FHIR Core (FHIR)
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R4
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FHIR Infrastructure
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References
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https://www.hl7.org/fhir/fhirpath.html documents behavior for ".trace()" that provides value here: creating better user-facing error messages.
We'll close this issue; but if the perceived value of these error messages is insufficient, we can raise another issue to discuss the trade-off.
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Grahame Grieve / Rick Geimer: 12-0-0
Description
The `ref-1` constraint looks like this:
```
reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))
```
This constraint contains the `trace()` function, which has no real use in production systems and will likely trigger log or console output in the FhirPath evaluator. Since ref-1 is a very common constraint, this might affect validation performance, for no added benefit.
I propose removing the call to `trace()` in this constraint.
