FHIR Mapping Language (FML)
0.1.0 - STU 1 World

FHIR Mapping Language (FML), published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/mapping-language-ig/ and changes regularly. See the Directory of published versions

StructureMap: SourceListOnlyOne

Official URL: http://hl7.org/fhir/uv/mapping-language/StructureMap/SourceListOnlyOne Version: 0.1.0
Standards status: Informative Computable Name: SourceListOnlyOne
Other Identifiers: OID:2.16.840.1.113883.4.642.40.89.43.25

Example demonstrating the only_one list option that errors on multiple elements

Language: en

/// url = 'http://hl7.org/fhir/uv/mapping-language/StructureMap/SourceListOnlyOne'
/// version = '0.1.0'
/// name = 'SourceListOnlyOne'
/// status = 'active'
/// description = 'Example demonstrating the only_one list option that errors on multiple elements'

uses "http://hl7.org/fhir/StructureDefinition/Patient" as source
uses "http://hl7.org/fhir/StructureDefinition/Patient" as target

group SourceListOnlyOne(source src : Patient, target tgt : Patient) {
  src.name only_one as v -> tgt.name as t then {
    v.family as f -> t.family = f "r1";
  } "r2";
}