FHIR profiling - overview and introduction...2018/11/14 · Using an extension in a resource • By...
Transcript of FHIR profiling - overview and introduction...2018/11/14 · Using an extension in a resource • By...
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Amsterdam, 14-16 November | @HL7 @FirelyTeam | #fhirdevdays18 | www.fhirdevdays.com
FHIR profiling - overview and introduction
Michel Rutten
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Who am I?
• Name: Michel Rutten• Company: Firely, Amsterdam• Background:
• 1982 Hello World on Philips P2000-T• 1998 Professional software developer
• Microsoft .NET• Healthcare IT
• May 2014 Technical Specialist at Furore• Member of the Firely FHIR development team• Specialized in FHIR Profiling & Conformance• Lead developer of Forge, the FHIR Profiling Editor
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Topics
1. The need for profiling2. FHIR Conformance layer3. Profiles4. Extensions5. Packages6. Implementation Guides7. Registry
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FHIR Profiling - Overview and Introduction
1. The need for profiling
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Why do we need profiling?
• Many different contexts in healthcare, but only a single set of resources
• FHIR provides a platform specification
• Requires further adaptation to context of use
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Profiling
Describe adaptations based on use & context:• Which resources & elements are used?• Which API features are used?• Which terminologies are used?• How to map these to local
requirements?
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Profiling
Allow for these usage statements:• To be authored in a structured manner
• Independent of serialization format
• To be published in a repository• To drive validation, code generation etc.
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FHIR Profiling - Overview and Introduction
2. FHIR Conformance layer
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FHIR Conformance Resources
Terminology
Naming System
Coding System
Value Set
Concept Map
Content
Structure Definition
Element Definition
Structure Map
Graph Definition
Operations
Operation Definition
Message Definition
Search Parameter
Compartment Definition
Misc.
Capability Statement
Implementation Guide
Test Script
Test Report
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StructureDefinition
Defines data structures:• Core datatypes• Core resources• Constraints on resources/datatypes• Extensions• Logical Models
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StructureDefinition
• Publish to repository/registry• Compare• Transform• Validate resource• Generate code• Generate UI
• Computable!
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OperationDefinition
• Defines REST interactions• Name of the operation• Input/output parameters• Behavior• Works on which resources?
• Extend/restrict the API
• Computable!
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SearchParameter
• Defines named search parameters for REST API
• Name• Interpretation?• Supports which resources?• Matches which resource elements?
• Extend/restrict the API
• Computable!
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CapabilityStatement
Defines capabilities of a FHIR serverBinds all conformance resources together
Usage:• Advertise supported capabilities• Describe required capabilities
• Computable!
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CapabilityStatement
Defines supported:• Serialization formats• Security services• Operations• Search Parameters• Resources• Profiles
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ImplementationGuide
• Defines scope of usage• Describes requirements for a FHIR implementation• Specifies links to:
• Relevant FHIR artifacts (profiles, IGs)• Editorial content (documentation)
• Usage:• Publish an implementation guide• Validate conformance
• Computable!
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FHIR Conformance Module
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Used to define the FHIR core spec
• Core datatypes• Core resources• Standard REST operations• Standard search parameters• Standard terminology
👢👢 Bootstrap🐶🐶 Eat Your Own Dogfood
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Canonical Url
• Unique identifier for a conformance resource (uri)• Author-assigned• Shared by all instances• Reference to a conformance resource
• Cf. Resource Id• Server-assigned• Unique per instance
• Example:http://hl7.org/fhir/StructureDefinition/Patient
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Canonical Url
EU Server US Server Asia Server
Name AcmePatient
Canonical http://acme.com/fhir/StructureDefinition/acme-patient
Resource Id 1 2 3
Uri http://acme-eu.com/.../1 http://acme-us.com/.../2 http://acme-cn.com/.../3
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FHIR Profiling - Overview and Introduction
3. Profiles
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Profile
Define constraints on:• A FHIR core datatype• A FHIR core resource• Another FHIR profile
Also used loosely to refer to:• An implementation guide• A conformance package
What is the difference between a resource
and a datatype?
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Layered Profiles
Core Profiles
National Profiles
Regional Profiles
Organizational Profiles
All resources
National resources
Regional resources
Organizatio-nal resources
More specific
More generic
Volume Volume
Conform to
Conform to
Conform to
Conform to
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StructureDefinition
Metadata:• Canonical url• Name, Title• Status (draft, active)• Date, Version (author assigned)• Author, publisher, contact, …• Base profile
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StructureDefinition
List of ElementDefinitions:• Name, cardinality, data type• Definitions, usage notes,
requirements• Default or fixed values• Complex constraints, length limits• Terminology bindings• Mappings to other specifications
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Complex constraints
Examples:• Patient.name.where(given = 'Wouter').exists()
• Observation.value.ofType(Quantity).unit
• MedicationAdministration.wasNotGiven implies MedicationAdministration.reasonNotGiven.exists()
XPath FHIR Path
FHIR DSTU1 FHIR DSTU2+
XML Query Language Graph traversal language (hl7.org/fhirpath)
Only supports XML Independent of serialization format; supports XML, JSON, RDF, …
Tightly bound to XML representation Independent of model; supports FHIR, V3, CIMI, QDM, …
Hard to express e.g. FHIR slicing (write-only) Fluent syntax; powerful, expressive and readable
hl7.org/fhirpath
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simplifier.net
Referring to a profile
ObservationCholesterol
6.3 mmol/LHigh
Observation Resource
StructureDefinitionLDLCholesterol
url: http://acme.org/fhir/StructureDefinition/LDLCholesterol
Observation Profile
Validate
ResolveAcme.org
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Versioning – non breaking change(s)
• Compatible• Old data can still be
• validated against new profile• Correctly interpreted against new
profile
• Maintain same canonical url• Bump author-assigned version
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Versioning –breaking change(s)
• Incompatible with previous profile version
• Must assign new canonical url
Published profiles should be considered as eternal contracts
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Differential vs. SnapshotDifferential component Snapshot Component
Partial list of definitions for elements constrained by this profile
Complete list of definitions for all elements in the datatype or resource
Specifies only constraints introduced by this profile
Specifies all constraints, incl. inherited from base
Authored by modeler Computer-generated (FHIR Operation)
Relatively small (KBs) Fairly large (MBs)
For efficient data interchange & storage For processing(validation, code generation, reporting etc.)
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Authoring Profiles
• Manually author XML/JSON• Excel (build tool)• Lantana Trifolia Workbench
https://trifolia.lantanagroup.com/• MDHT UML-based modelling tool
https://projects.eclipse.org/projects/modeling.mdht
• Forgehttps://simplifier.net/forge/
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FHIR Profiling - Overview and Introduction
4. Extensions
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Extensions
Allows to define and introduce custom elements
Example: Patient race, ethnicity• Registration is mandatory in US• Registration is illegal in EU• Cannot be defined by the core
Patient resource definition!
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Defining an extension
• Defined by StructureDefinition resource• Unique identifier: canonical url• Define extension context
• Where can this extension be used?• Target structure: Resource | Datatype | Extension• List of type names and/or element paths
• Reusable in many profiles
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Using an extension in a resource
• By default, FHIR allows all resource elements to specify any number of extension elements
• Inherited from Element.extension
• A profile can constrain the extension list of each resource element• Require/prohibit certain extensions• Disallow all extensions
• Extension elements in profiles refer to external extension definitions• Element.extension.url = <target canonical url>
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StructureDefinitionnl-core-patienthttp://hl7.nl/fhir/StructureDefinition/nl-core-patient
Patient.name : HumanName…Patient.nationality : Extension(patient-nationality)
Using extensions
PatientIrma Jongeneel-de Haas
…
Nationality: NL
Extension Definition
Patient Instance Patient Profile
StructureDefinitionPatient-nationalityhttp://hl7.org/fhir/StructureDefinition/patient-nationality
"code" : CodeableConcept"period" : Period
Extension value in instance Reference to external extension definition
Conforms to profile
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Primitive Extensions
• Define a single custom element• Constrain the type of the element
value• Primitive value• Complex value
• Examples:• patient-birthTime (dateTime)• birthPlace (Address)
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Complex Extension
• Define a set of related custom elements• Elements may be nested (subtree)
• Constrain the type of each element value
• Example: patient-nationality• code: CodeableConcept• period: Period
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FHIR Profiling - Overview and Introduction
5. Packages
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FHIR Package
Versioned and published set of conceptually related FHIR conformance resources:• Structure Definitions (Profiles)• Value Sets• Operation Definitions• Search Parameter Definitions• Example Resources• …
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FHIR Package Manager
• Manage FHIR packages• Find• Install• Upgrade• Configure• Remove
• Based on NPM• Node.js Package Manager
• Resolve canonical url to package
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HL7 FHIR
US Core NL Core
NL Medicatie
ZIB
Dependencies
• A package can depend on other (external) packages
• Example: FHIR STU3 Core Resource & Datatype definitions
• Package Manager – Install Package• Resolve all dependencies, recursively• Install/update to required package
versions
Resolve
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Publish packages to Simplifier
https://simplifier.net/packages/
• Publish versioned FHIR packages• Configure package dependencies• Search package by name• Search package by canonical url
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Forge Package Manager
Forge 19.7 for STU3FHIR DevDays Amsterdam 2018 Editionhttps://simplifier.net/downloads/forge
• Browse and download FHIR packages from Simplifier registry
• Add/remove project dependencies• Select profile extensions from package• Derive profile from external dependency
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FHIR Profiling - Overview and Introduction
6. Implementation Guides
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Implementation Guide Resource
• Define content structure• References to external artifacts
• Page content files• Images, CSS, JavaScript
• Supported page formats:• Markdown• HTML
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Implementation Guide Resource
• Define conformance package(s)• Set of conceptually related artifacts• Based on FHIR NPM package
• Specify references to external artifacts
• StructureDefinition• OperationDefinition• SearchParameter• ValueSet• Example resources
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Implementation Guide Resource
Author Create manually or generate, e.g. from Simplifier
Exchange Inbetween IG authoring and/or publication environments
Publish To registry Render content (website, PDF, print, …) cf. FHIR spec
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Implementation Guides & FHIR Packages
• Implementation Guide• Provides human-readable information (narrative)• Contains formatted text, pictures, attachments, …• Explains to developers how to implement a specific use case• Publish to local/online website or to PDF
• Package• Provides machine-readable information (computable)• Contains conformance resources• Allows machines to validate, generate code, generate UI, …• Publish to FHIR Package server
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Authoring Implementation Guides
IG Builder• Official HL7 open source command line tool• Can render IG resource as a website
Examples:• FHIR specification• DAF Argonaut
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Authoring Implementation Guides
Simplifier• Browse & find published IGs• Supports online IG authoring & publication• Embed rendered artifacts
Examples:• HL7 Germany• Devices on FHIR POCD
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Authoring & Publication Workflows
Create
Collaborate
ReviewUpdate
Finalize
Publish
Distribute
UpdateArchive
Unpublish
Publish
Draft Final
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FHIR Profiling - Overview and Introduction
7. Registry
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Official HL7 FHIR registries
• HL7 FHIR Profile registry• https://registry.fhir.org/• Find official profiles published by HL7 intl. & WGs
• HL7 FHIR Implementation Guide registry• http://www.fhir.org/guides/registry• Browse official HL7 implementation guides
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• Public FHIR registry• Search, browse & find FHIR
conformance resources:• Profiles, IGs, Valuesets, Examples, …
• Contains:• Official HL7 profiles• HL7 affiliate profiles• Private company profiles• Public user profiles https://simplifier.net
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• Validate examples against profiles• Are my example resources valid?
• Incoming & outgoing references• Who is depending on my profiles/extensions?
• Download statistics• How popular are my profiles?
• Official back-end for https://registry.fhir.org/• Publish from Simplifier to HL7 registry
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Implementation Guides
Online WYSIWYGIG Editor
Embed rendered profiles & examples
Publish / Export
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FHIR Profiling - Overview and Introduction
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Learn more!
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Coffee!
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