Stream: fhir/infrastructure-wg
Topic: Requested change for Range Constraint rng-2
Kurt Allen (Jan 24 2020 at 14:35):
I am seeing an issue with the Range constraint rng-2 when I use a range or quantity as a pattern and don't set the range value.
i.e. I am constraining the system and code, but not the value.
"patternRange": {
"low": {
"system": "http://unitsofmeasure.org",
"code": "tot"
},
"high": {
"system": "http://unitsofmeasure.org",
"code": "tot"
}
When I run the IG publisher, I get an error from Range constraint rng-2
StructureDefinition/AbnormalityCyst: StructureDefinition.snapshot.element[75].pattern.ofType(Range) error rng-2: If present, low SHALL have a lower value than high [low.empty() or high.empty() or (low <= high)]
StructureDefinition/AbnormalityCyst: tructureDefinition.snapshot.element[113].pattern.ofType(Range) error rng-2: If present, low SHALL have a lower value than high [low.empty() or high.empty() or (low <= high)]
Obviously the Range constraint rng-2 is that the low value should be greater than the high value and since neither are set that is not true, (though it is also not false (kinda a quantum mechanics kind of thing :-))).
Should the rule be changed to ignore unset values in patterns?
@Lloyd McKenzie had the following comment about this in the original thread.
There could be situations where the low or high value are expressed with an extension (e.g. because it's a formula rather than a fixed value), so this would be a problem there too. I'd be in favor of revising the invariant to say low.value.empty() or high.value.empty() instead, which would address this issue.
Grahame Grieve (Jan 24 2020 at 20:06):
yew please create a task
Kurt Allen (Jan 30 2020 at 15:23):
thx...
https://jira.hl7.org/browse/FHIR-25736
Last updated: Apr 12 2022 at 19:14 UTC
