FHIR FHIRPath Function: ofType
This page is part of FHIR FHIRPath (FHIR-specific extensions). Base spec lives at FHIRPath.
ofType(type : type specifier) : collection
Returns a collection that contains all items in the input collection that are of the given type or a subclass thereof. This is as defined as in the base FHIRPath specification, but implementers should be aware that in FHIR, only concrete core types are allowed as an argument. All primitives are considered to be independent types (so markdown is not a subclass of string). Profiled types are not allowed, so to select SimpleQuantity one would pass Quantity as an argument.
Observation.value.ofType(canonical) Observation.value.ofType(dateTime) | Observation.value.ofType(Period).start // selects either dateTime or Period starts (both of type dateTime)