FHIR FHIRPath Function: extension

This page is part of FHIR FHIRPath (FHIR-specific extensions). Base spec lives at FHIRPath.

extension(url : string) : collection

Will filter the input collection for items named "extension" with the given url. This is a syntactical shortcut for .extension.where(url = string), but is simpler to write. If the input collection is empty or the url is empty, the return value will be an empty collection.

Patient.extension('http://hl7.org/fhir/StructureDefinition/patient-mothersMaidenName').value

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