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: Constants

Official URL: http://hl7.org/fhir/uv/mapping-language/StructureMap/Constants Version:
Standards status: Informative Computable Name: Constants

Example demonstrating reusable constants defined with the let keyword

/// url = 'http://hl7.org/fhir/uv/mapping-language/StructureMap/Constants'
/// name = 'Constants'
/// status = 'active'
/// description = 'Example demonstrating reusable constants defined with the let keyword'

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

let defaultSystem = 'http://example.org/systems/id';
let maxLen = 20;

group ConstantsGroup(source src : Patient, target tgt : Patient) {
  src.id as v -> tgt.id = truncate(v, maxLen) "r1";
}