FLC Implementation Guide
0.2.3 - ci-build

This page is part of the FLC Implementation Guide (v0.2.3: Pre-Release Draft) based on FHIR (HL7® FHIR® Standard) R4. The current version which supersedes this version is 0.2.4. For a full list of available versions, see the Directory of published versions

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Official URL: http://canonical.fhir.link/flc/base/ImplementationGuide/flc.fhir.base Version: 0.2.3
Draft as of 2025-11-18 Computable Name: flc

FLC Implementation Guide

Welcome to the Implementation Guide for FHIR Liquid Conversion (FLC), a powerful, template-driven approach to converting data into FHIR using Liquid templates enriched with terminology mappings. This guide is maintained by Service Well AB, the owner and maintainer of this FLC framework and associated IG tooling.

🔍 What is FLC?

FHIR Liquid Conversion (FLC) is a structured, opinionated way of managing input-to-FHIR transformations using Liquid templates and standard FHIR IG tooling. It builds on Microsoft's FHIR Converter but introduces several key improvements:

✅ Advantages over StructureMap and Traditional FHIR Mapping:

Feature Microsoft FHIR Converter FLC
Declarative Mapping Language ✅ Liquid ✅ Liquid + FHIR metadata
Terminology Integration ❌ Manual ✅ Built-in FHIR Terminology support
Testable / Versionable ✅ File-based testing ✅ Full IG + test bundle
Canonical Support ❌ Local only ✅ Fully FHIR-native
Dependency Handling ❌ Manual imports ✅ Via dependencies in sushi-config.yaml
Reusable Across Projects ✅ Azure Container Registry ✅ IG-packaged and distributable

FLC enables both human-readable and machine-executable transformations, directly linked to terminology servers and structured with official FHIR packaging mechanisms.

Overall, FLC provides a more FHIR-native, version-controlled, and distributable conversion platform that bridges informatics and IT development effectively.

🧩 Components Explained

  • StructureMap (with profile LiquidStructureMap) is used to declare:
    • Source structure (e.g., FLCSourcePatient)
    • Target structure (e.g., Patient)
    • Linked Liquid template file (e.g., ExamplePatient.liquid)
    • Terminology packages (ToDo)
  • ConceptMap links external/local source codes to FHIR target values
  • Liquid templates transform parsed input → FHIR JSON using placeholders

📬 Contact

This guide is maintained by Service Well AB. For feedback or inquiries:

📧 info@servicewell.se 🌐 https://www.servicewell.se