Stream: implementers
Topic: use of toQuantity in a SearchParameter expression
Lee Surprenant (Jun 23 2020 at 22:19):
I'm brainstorming potential solutions for FHIR#25174 and I had a couple questions about search parameter expressions:
- Is there any rule (formal or informal) that all core searchparameters must have both an xpath and a fhirpath expression?
- Is there any rule (formal or informal) that all core searchparameters fhirpath expressions must be limited to "SimplePath" (a simple subset of FHIRPath)?
Lee Surprenant (Jun 23 2020 at 22:21):
in this particular issue, the CDS group wanted to define a single search parameter which can search over their choice of either decimal (which maps to number) or Range (which maps to quantity) and so I was wondering if it might be possible to "cast" the decimal to a quantity within the search parameter expression
Brian Postlethwaite (Jun 23 2020 at 23:03):
The search engine would likely need to canonicalize the units so that comparison is actually possible in many cases.
Lee Surprenant (Jun 23 2020 at 23:22):
in this particular case the unit is fixed to %
Lee Surprenant (Jun 23 2020 at 23:22):
which is why I thought it might be possible to do safely
Lee Surprenant (Jun 23 2020 at 23:23):
I think they would have used a decimal range instead of Quantity Range if there were such a type...
Lee Surprenant (Jun 24 2020 at 17:08):
at the request of committee, we opened a new issue FHIR#27875 instead of re-opening FHIR#25174 (seems the JIRA re-open process is set up for ballot-comment re-opens and thus has too-stringent rules). Anyway, new tracker but same issue.
Last updated: Apr 12 2022 at 19:14 UTC
