More Related Content Similar to FHIR tutorial - Afternoon (19) FHIR tutorial - Afternoon1. © 2012 HL7 ® International. Licensed under Creative Commons. HL7 & Health Level Seven are registered trademarks of Health Level Seven International. Reg. U.S. TM Office.
HL7 FHIR Training
course
Ewout Kramer
March 2014
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Afternoon program
Support for Implementing FHIR
Bundles, Documents and Messages
Exercise #3
Search and Using the C#/Java API‟s
Exercise #4
Profiles and Conformance
The HL7 family & FHIR
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DEVELOPER RESOURCES
Get started with FHIR quickly
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Browsing the site
REST API
Data Types
XML & JSON
Codes / Terminologies
Resource List
Stack Overflow
Public Test servers
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The FHIR distribution
Under Implementation-Support-Downloads:
The XSD schema‟s / schematrons
The Java / C# / Delphi zips (model, serializers,
parsers, etc, both code & binary)
All xml + json examples
Full spec for offline reading (always have your
FHIR with you)
Note! .NET implementation has moved to GitHub,
distribution by NuGet (.NET) and Maven (Java)
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Publication process
.INI
Publication tool
(org.hl7.fhir.tools.jar)
Java, C#,
Delphi
eCoreDefinitions.xml
Website
Validation
Schema‟s
Examples
DictXml Resource
profiles
Resource
UML
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Generator writers!
There‟s a file called eCoreDefinitions.xml
that the C# generator runs of. It has all
details from the definitions
There are Profiles for each resource,
basically describing the “unconstrained”
resources
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SEARCH FUNCTIONALITY
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Getting “all” patients
http://server.org/fhir/Patient
Always returns a paged feed
Use _count to indicate number of results per page
Special case of the “real” search operation:
http://server.org/fhir/Patient/_search?name=eve
http://server.org/fhir/Patient?name=eve
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Search (patient)
Each resource has a set of “standard”
search operations, so not every element
can be searched!:
Our last search
used this one
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Combining parameters
Specifying multiple parameters finds
resources matching all params “AND”
Parameters may list multiple values “OR”
http://server.org/fhir
/Patient/_search?
birthdate=1972-11-30
&language=NL,FR
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Search (patient)
Each search parameter has a „type‟
Parameter
Type
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Ok I get it…or not?
http://server.org/fhir/Patient/ 406 hits
http://server.org/fhir/Patient?gender=M 234 hits
http://server.org/fhir/Patient?gender=F 167 hits
Total: 234 + 167 = 401
http://server.org/fhir/Patient/ 406 hits
http://server.org/fhir/Patient?gender=M 234 hits
http://server.org/fhir/Patient?gender=F 167 hits
http://server.org/fhir/Patient?gender:missing=true 5 hits
Total: 234 + 167 + 5 = 406
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Chained searches
Patient has a search for “name”.
Observation has a search for “subject” (the
id of the Patient, Group or Device)
How do I find Observations for a
patient, searching using his name?
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2 queries in 1
You (as a client) don‟t need to do separate
operations, just one:
http://server.com/fhir/Observation/_search?
subject.name=jim
But note: this still only works on the predefined
search parameters. You cannot just use any
property of the resource.
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More optimalizations
Say we do:
http://fhir.com/fhir/Observation?date=2014-01-20
We get back: a Bundle with 0..* “Observations”
Now, usually, wouldn‟t we want the Patient
information too? => Need to do “N” queries
for the Observation‟s “subject”
Quicker:
?_include=Observation.subject
Returns both Observations + Patients
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BUNDLES
How FHIR uses Atom to communicate sets of resources
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Communicating lists
We need to communicate lists of Resources
Search result
History
Documents or messages
Multiple-resource inserts (“batches”)
So, we need an industry-standard to
represent lists, and a place to put our
metadata
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Bundle
Resource
Narrative
Elements
ExtensionsExtensions
Resource
Metadata
Bundle
Metadata
Resource
Resource
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Bundles
Atom RFC 4287 + Tombstones RFC 6721
Poll-based protocol for keeping up-to-date
with newsfeeds (RSS and Atom)
You can “subscribe” to a FHIR feed and get
updates
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New reports in the mail
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An example Bundle
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Patient
MRN 22234
“Ewout Kramer”
30-11-1972
Amsterdam
Resource metadata
Metadata
Resource Identity
http://fhir.hl7.org/Patient/23E455A3B
Last updated
2013-12-23T23:33:01+01:00
http://hl7.org/fhir/tag/profile
http://hl7.org/fhir/Profile/us-core
http://hl7.org/fhir/tag
http://example.org/fhir/Status#Test
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Resource Entry
Resource id
Last modified
Resource content
Human-readable form,
just like Resource.text
Tags
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Atom in JSON
There‟s not yet a way to render Atom in
JSON, though there are initiatives, all ugly.
So, we had to (sorry) roll our own….
…very straightforward, single-purpose
Atom JSON solution
(Note: MIME type is still application/json!)
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Json Atom - Example
{
"title": "Search result",
"updated": "2012-09-20T12:04:45Z",
"id": "urn:uuid:50ea3e5e-b6a7-4f55-956c-caef491bbc08",
"link": [ { "rel": "self", "href": "http://server.org/fhir/Patient?format=json" } ],
"entry": [
{ "title": "Resource of type Patient, with id = 1 and version = 1",
"link": [ { "rel": "self", "href": "http://server.org/fhir/Patient/1/_history/1" } ],
"id": "http://server.org/fhir/Patient/1",
"updated": "2012-05-29T23:45:32Z",
"published": "2012-09-20T12:04:47Z",
"author": [ { "name": "Grahame Grieve / HL7 publishing committee" } ],
"content":
{ "Patient": { } }
}
]
}
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BEYOND REST
How FHIR supports documents and messages
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What’s a document?
Persistence: continues to exist in an unaltered state
Stewardship: maintained by a person or organization
entrusted with its care.
Potential for authentication: an assemblage of
information that is intended to be legally authenticated.
Wholeness. Authentication of a clinical document applies
to the whole and does not apply to portions of the
document without the full context of the document.
Human readability. A clinical document is human
readable.
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The Document resource
A single Resource, very often a List
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Documents – are
bundles
Observation Resource
Composition Resource
Section
Section
Device Resource
Patient Resource
Prescription Resource
<feed>
<entry>
<Composition />
</entry>
<entry>
<Observation />
</entry>
<entry>
<Device />
</entry>
<entry>
<Prescription />
</entry>
<entry>
<Patient />
</entry>
</feed>
AttesterMetadata
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Tag as “Document”
This Bundle
is a
Document
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Communicating
documents
You can “drop” your document on
http://server.org/fhir/Mailbox
No storage or disassembly is implied, your
just posting a document in its entirety.
Servers can implement any specific
functionality as required between trading
partners when receiving such a document.
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Communicating
documents
You can store your document using
http://server.org/fhir/Document
Storage, NO disassembly is implied,
document (and signature) stays intact
Search is supported (you search on it‟s
Message header – Composition)
NEW!
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MessageHeader
Resource
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Messages – are bundles
Observation Resource
Message Resource
source destination
Device Resource
Patient Resource
<feed>
<entry>
<MessageHeader />
</entry>
<entry>
<Observation />
</entry>
<entry>
<Patient />
</entry>
<entry>
<Device />
</entry>
</feed>
event
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Tag as “Message”
This Bundle
is a
Message
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Sending messages
Again, REST not necessary, but…
There is an explicit REST endpoint:
http://server.org/fhir/Mailbox
No storage implied. Might be a router,
converted to v2, etc. etc.
The server can process them based on the
event code and return the response as
another message (again a bundle).
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Exercise #3
Composing a Document
(45 minutes)
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HL7.FHIR SUPPORT API
Using the C# Reference Implementation
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Reference
implementations
- Contents
- Model – classes generated from the spec
- Parsers – Parsers generated from the spec
- Serializers – Serializers generated from the spec
- FhirClient
- Validation (currently Java only)
- Java – Everything on the downloads page
- .NET – NuGet “FHIR”, or GitHub “fhir-net-api”
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A FHIR Resource in C#
public partial class Observation : Resource
{
// Codes that provide reliability information about an observation
public enum ObservationReliability {Ok, Ongoing, …}
// Codes identifying interpretations of observations
public enum ObservationInterpretation {N, A, L, H }
public CodeableConcept Name { get; set; }
public List<ObservationReferenceRangeComponent> ReferenceRange { get; set;}
public Code<Observation.ObservationReliability> Reliability { get; set; }
public ResourceReference Performer { get; set; }
}
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Object Model
51
[FhirResource("DiagnosticReport")]
public partial class DiagnosticReport : Resource
{
public Code<ObservationStatus> Status {…}
public Instant Issued {…}
public ResourceReference Subject {…}
public ResourceReference Performer {…}
public Identifier ReportId {… }
public
List<DiagnosticReportRequestDetailComponent>
RequestDetail { …}
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Primitives are not really
primitive…
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Parsing/Serializing using
C#
// Create a file-based reader for Xml
XmlReader xr = XmlReader.Create(
new StreamReader(@"publishobservation-example.xml"));
// Parse the Observation from the stream
var obs = (Observation)FhirParser.ParseResource(xr);
// Modify some fields of the observation
obs.Status = Observation.ObservationStatus.Amended;
obs.Value = new Quantity() { Value = 40, Units = "g" };
// Serialize the in-memory observation to Json
var jsonText = FhirSerializer.SerializeResourceToJson(obs);
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Parsing/Serializing using
Java
XmlParser xml = new XmlParser();
Observation obs = (Observation)xml.parse(new
FileInputStream(“observation.xml"));
obs.setStatusSimple(ObservationStatus.amended);
Quantity newValue = new Quantity();
newValue.setValueSimple(new BigDecimal(40));
newValue.setUnitsSimple("g");
obs.setValue( newValue );
ByteArrayOutputStream bos = new ByteArrayOutputStream();
JsonComposer comp = new JsonComposer();
comp.compose(bos, obs, true);
String json = bos.toString("UTF8");
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Bundles
For both Java and C#, reference has
custom-built Atom parser
For .NET, you could use the framework‟s
SyndicationFeed
A bit more low-level
No support for deleted-entries (even parse
problems)
Incompatible with WinRT (Win8 mobile apps)
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Bundles in C#
Abstraction on top of Atom parser
Bundle = feed, BundleEntry = entry.
Bundle result = new Bundle() { Title = "Demo bundle" };
result.Entries.Add(new ResourceEntry<Patient>()
{ LastUpdated=DateTimeOffset.Now, Content = new Patient() });
result.Entries.Add(new DeletedEntry()
{ Id = new Uri("http://..."), When = DateTime.Now });
var bundleXml = FhirSerializer.SerializeBundleToXml(result);
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Bundles in Java
AtomFeed feed = new AtomFeed();
feed.setTitle("Demo bundle");
AtomEntry pat = new AtomEntry();
pat.setUpdated(Calendar.getInstance());
pat.setResource(new Patient());
feed.getEntryList().add(pat);
AtomEntry del = new AtomEntry();
del.setUpdated(Calendar.getInstance());
del.setDeleted(true); del.setId("http://nu.nl/fhir");
feed.getEntryList().add(del);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
AtomComposer comp = new AtomComposer();
comp.compose(bos, feed, true);
String xml = bos.toString("UTF8");
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Using FHIR Client in C#
var client = new FhirClient(
new Uri("http://fhir.com/svc/fhir"));
var patEntry = client.Read<Patient>("1");
var pat = patEntry.Resource;
var restId = patEntry.Id;
var tags = patEntry.Tags;
pat.Name.Add(HumanName.ForFamily("Kramer")
.WithGiven("Ewout"));
client.Update<Patient>(patEntry);
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Using FHIR Client in
Java
FHIRClient client = new FHIRSimpleClient();
client.initialize("http://spark.furore.com/fhir");
AtomEntry<Patient> pe = client.read(Patient.class, "1");
Patient p = pe.getResource();
HumanName hn = new HumanName();
hn.getFamily().add(Factory.newString_("Kramer"));
hn.getGiven().add(Factory.newString_("Ewout"));
p.getName().add(hn);
client.update(Patient.class, p, "1");
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Exercise #4
Using the FHIR
C# and Java API’s
(60 minutes)
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PROFILES, VALIDATION
AND CONFORMANCE
Introducing
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The need for Profiles
Many different contexts in healthcare, but a
single set of Resources
Need to be able to describe restrictions
based on use and context
Allow for these usage statements to:
Authored in a structured manner
Published in a repository
Used as the basis for validation, code, report and UI
generation.
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Profiling a resource
Demand that the identifier uses your
national patient identifier
Limit names to just 1 (instead of 0..*)
Limit maritalStatus to another set of
codes that extends the one from
HL7 international
Add an extension to support
“RaceCode”
Note: hardly any
mandatory elements in
the core spec!
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Structured & published
A Profile is just a “normal” Resource
Any FHIR server could serve Profiles (just
like Patients, Observations, etc…)
So, any FHIR server is a profile repository!
A resource is simply referred to by its URI:
e.g. http://hl7.org/fhir/Profile/iso-21090
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Using profiles
When communicating a resource, you can
indicate the profiles it conforms to.
A server might explicitly state it only accepts
resources conforming to a certain profile
(and verify!)
You can ask a FHIR server to validate a
resource against a given profile
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Tagging a Resource
Patient
MRN 22234
“Ewout Kramer”
30-11-1972
Amsterdam
http://hl7.org/fhir/tag/security
http://hl7.org/fhir/v3/ActCode#TABOO
http://hl7.org/fhir/tag
http://example.org/fhir/Status#Test
http://hl7.org/fhir/tag/profile
http://hl7.org/fhir/Profile/us-core “a claim that the Resource
conforms to the profile
identified in the term”
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Who publishes?
http://www.hl7.org/fhir/Profile/iso-21090
http://www.hl7.nl/fhir/Profile/patient-nl
http://www.health4all.org/fhir/Profile/
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What’s in a profile?
Metadata
Identifier
Name, Version
Publisher
Description, Code
Status
Date (of publication)
Resource and
Datatype
Constraints
Extension
Conformance
Resource
(via Tag)
ValueSet
ValueSet
Extension in
Resource
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Scale / design
Make a profile with just extensions
Make a profile with just 1 resource +
extensions on that resource
Make a profile with all (say national)
resources + extensions.
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Profile metadata
Identifier: Universally unique identifier, assigned by author
value=“urn:hl7.org:extensions:iso-21090“ or “2.16.840.1.113883.10.20.2.1”
Version: Version of the profile, manually maintained by author. Suggested
format: a timestamp (e.g. 2013-01-01T12:34:45)
Name: Free natural text name (e.g. “ISO 21090 Data Type Extensions”)
Publisher: organization or individual responsible for publishing. Should be
populated (e.g. “FHIR Project Team“)
Telecom: one or more contact points of the publisher (telephone, email,
website etc)
Description: longer description of the contents of the profile
Code: one or more coded descriptions to help with finding the profile
Status (fixed choice of draft, active, retired) + experimental Y/N
Requirements: scope & usage (the “need” or “why” of the profile)
Date (of publication), e.g. “2013-07-07"
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(Distributed) validation
App‟s server
Store &
Validate
Country validation server
Profile X
Profile Y
Profile Y
Validate
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Validation
When receiving an XML resource
1. Validate using schema
2. Run schematrons
When receiving JSON
1. Parse the JSON
2. Serialize to XML
3. Validate using schema
4. Run schematrons
There‟s a validation pack for Java
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Operation Outcome
When something goes wrong….return the
OperationOutcome Resource!
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Conformance
There‟s a resource for documenting conformance
to FHIR
Can be used for:
Stating how a specific system instance behaves
Defining how a software system is capable of behaving
(including configuration options)
Identifying a desired set of behavior (e.g. RFP)
To declare themselves “FHIR Conformant”, a
system must publish a Conformance instance
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Conformance
Resource
• Which wire formats supported?
• Which resources?
• What documents, messages does
the server accept, what does the
content look like?
• Which protocols? http? Mllp? ftp?
• Which operations (read, create,
update, search)
• Which FHIR version?
• What search operations?
• Is this a test server?
• Who can I contact?
• What‟s the name of the software?
http://www.hl7.org/implement/standards/fhir/conformance.html
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How to get conformance
Conformance is again, just a Resource
Any FHIR server will publish his own
conformance at a special endpoint
A FHIR server may store and publish any
number of additional Conformance
resources, so you can refer to them
Able to validate by automated testing
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HL7 FAMILY AND FHIR
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V2 and FHIR
Similarities
Built around re-usable
“chunks” of data
Strong forward/backward
compatibility rules
Extensibility mechanism
FHIR Differences
Each chunk (resource) is
independently
addressable
More than messages
Human readable required
Extensions don‟t collide,
are discoverable
Modern tools/skills
Instances easy to read
Lighter spec
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Migration – v2
Already have an integration engine that
supports translation between v2 and FHIR
Resources map to segments reasonably well
As always, the challenge with v2 mapping is
the variability of v2 interfaces
“Common” mappings can be created, but they
won‟t be one size fits all
HL7 v2
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…and v2 mappings
Every Resource has v2 mappings specified, e.g.:
http://www.hl7.org/fhir/patient-mappings.html#http://hl7.org/v2
Patient
identifier PID-3
name PID-5, PID-9
telecom PID-13, PID-14, PID-40
gender PID-8
birthDate PID-7
deceased[x] PID-30
address PID-11
maritalStatus PID-16
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V3 and FHIR
Similarities
Based on RIM, vocab &
ISO Data types
foundations
Support XML syntax
FHIR Differences
Simpler models & syntax
(reference model hidden)
Friendly names
Extensibility with
discovery
Easy inter-version wire
compatibility
Messages, documents,
etc. use same syntax
JSON syntax too
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CDA and FHIR
Similarities
Support profiling for
specific use-cases
Human readability is
minimum for
interoperability
APIs, validation tooling,
profile tooling
(See v3 similarities on
prior slide)
FHIR Differences
Can use out of the box –
no templates required
Not restricted to just
documents
Implementer tooling
generated with spec
(See v3 differences on
prior slide)
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Migration – CDA
Made more complex by human-readable
nature
Need to ensure text <-> entry linkages are
retained
Will best be handled on a template by
template basis
Likely start with important ones like C-CDA
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For v3 CDA…
Documents MAY be communicated using
REST:
And stored as a single “blob” – the whole
document
And disassembled into the contained resources
But ftp, MLLP, e-mail, SOAP is all fine
There is a project underway mapping Green
CDA to FHIR
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…and v3 mappings
Every Resource has v3 mappings specified, e.g.:
http://www.hl7.org/fhir/patient-mappings.html#http://hl7.org/v3
Patient Patient
identifier ./id
name ./name
telecom ./telecom
gender ./administrativeGender
birthDate ./birthTime
deceased[x] ./deceasedInd
address ./addr
maritalStatus ./maritalStatus
multipleBirth[x] .multipleBirthInd
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FHIR and Services
Similarities
Encourage context
neutral, re-usable
structures with defined
behavior
RESTful interface is a
simple SOA interface
FHIR differences
Consistent data
structures across
services
Ease of transport across
paradigms message <->
service <-> document <->
REST
Standard framework for
defining/discovering
services
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Market Sharev2
• De facto standard for in-
institution communication
• Standard in many countries
for cross-institution
communication
CDA
• High market penetration,
particularly of CCD and CCDA
variants due to meaningful
use
• Significant on-going growth
v3
• Mandated use in a few
jurisdictions
• Little uptake outside of those
mandates
FHIR
• None
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Maturityv2
• In use for over 25 years
• Broadly supported by industry
tools
• Now on
• Familiarity with both
capabilities and limitations
(and work-arounds)
CDA
• In use for over 12 years
• Implemented in a variety of
settings all around the world
v3
• In development for over 13
years
• Some specifications have had
multiple releases
• Limited uptake
FHIR
• First thought of less than 2
years ago
• Just passed DSTU ballot
• Won‟t be a normative spec for
several more years, minimum
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So why use anything
else?
FHIR is brand new
No market share
Only recently passed DSTU ballot
Little track record
Business case
No-one dumps existing working systems just
because something new is “better”
Large projects committed to one standard won‟t
change direction quickly (or even at all)
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Simple message
Yes, FHIR has the potential to supplant HL7 v3,
CDA and even v2
However
It‟s not going to do so any time soon
No one's going to throw away their investment in
older standards to use FHIR until
1. The specification has a good track record
2. It‟s clear the new thing provides significant benefits
HL7 will support existing product lines so
long as the market needs them
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(XDS) references
Document Reference Resources are used in document indexing systems,
and are used to refer to:
• CDA documents in FHIR systems
• FHIR documents stored elsewhere (i.e. registry/repository following the
XDS model)
• PDF documents, and even digital records of faxes where sufficient
information is available
• Other kinds of documents, such as records of prescriptions.
A document reference resource is used
to describe a document that is made
available to a healthcare system.
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IHE MHD
“This winter (…) the Volume 2 part of Mobile
Health Documents (MHD) will be replaced with
the appropriate content describing a profile of
DocumentReference to meet the needs of
MHD and the family of Document Sharing in
XDS, XDR, and XCA.”
John Moehrke, august 16, 2013
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Balloting plans
First Draft Standard for Trial Use ballot (DSTU) complete
Recently HL7 decided FHIR is now published as a DSTU
Will provide a semi-stable platform for implementers while still
allowing non-backward-compatible change for Normative version
if implementation experience dictates
Additional DSTU versions roughly annually to make fixes,
introduce new resources
Normative is around 3 years out
We want *lots* of implementation experience before committing to
backward compatibility
93
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Next Steps for you
Read the spec: http://hl7.org/fhir
Try implementing it
Come to a (European?) Connectathon!
fhir@lists.hl7.org
#FHIR
Implementor’s Skype Channel
FHIR Developer Days (November 24 – 26), Amsterdam
StackOverflow: hl7 fhir tag
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The End – The big brake!
Questions?
Editor's Notes Look atmodifiers on the HL7 FHIR site (:exact, :missing, etc.) - In our previous section on REST we saw how we mapped this metadata to HTTP headers, but in a query result, we need to find a way to map this to a list, Atom Note that the id of the resource is kept outside the resource itselfAtom has many other meta-data items (not shown), which we will discuss later. Remember, all updated timestamps in FHIR (type: ‘instant’) are precise to at least the second and ALLWAYS carry a timezone! See how the resource meta-data is mapped to equivalent Atom membersAuthor is required by atom, so you’ll have to keep track who authored the resource, which might well be the user that POSTed it to your RESTful endpointSummary is optional, but it is easy to fill it with the Resource’s <text> (human readable narrative), so Feed readers have a way to display the contents of a resource. Yes, this means the summary is present twice in the entry.All elements you see here are Atom spec, not FHIR Multiple versions are supported explicitly by Atom by having multiple entries with the same id, but a different ‘updated’ dateNotice how the ‘self’ links do differ, these are different versions after all. Just take a quick glimpse, it’s a pretty trivial translation of the Xml form to JSON, removing all needs for namespaces and attributes, and turning repeating elements into JSON arrays. A Document, no matter how nested, is flattened to a list of entries, the Document’s header being the first.The document header (and any other the other resources) refer to each other using normal references to reflect the document’s nesting.Of course, there may be a digital signature (on the whole Bundle) to attest to the content of the document. * But ofcourse, some server could have functions to disassemble documents on reception. Since the contents of documents are resources, each of the contained resources (including the Document header) can be stored using the normal REST interface. But they are no longer the document anymore! * But ofcourse, some server could have functions to disassemble documents on reception. Since the contents of documents are resources, each of the contained resources (including the Document header) can be stored using the normal REST interface. But they are no longer the document anymore! A Message is similar, refers (amongst others) to its author, and contains information about the source, destination and the event that triggered it.A message contains 1 “data” resource, which is the root of the payload of the message. This is just a normal resource, which in its turn can refer to other related resources. * It’s the same drop-off point as for documents! Enums are generated for coded types with required, fixed, valuesetsNested classes are defined for each component in a Resource, all nested directly within the ResourceCardinality > 1 => becomes a List<>Cardinality 1 => Not expressed in model, but done in validationAll classes are partial so you can add code them in another code file (keeping generated+handcrafted code separate) * You might wonder: Since bundles are Atom, why not use standard Atom parsers? “Drive-by” or “bottom-up” operability: “Communicate first, standardize later”First, business partners. Then, collaborations, communities. Maybe, finally,nation-wideIt’s a naturalprocessthatpeoplewill want to make itwork first, thenonlycoordinatewhattheyreallyneedto, andthenrealizetheycanbroadentheir approach to a community.“Support”, of course top-down shouldstillbepossible! Maybe even a combi in the long-term A server might defer validation to another server (because it doesn’t know the profile)A server may fetch the “unknown” profile and validate it itselfThere may be several servers sharing the work Lower learning curve Text linkages not as important when not human-attested FHIR allows defining additional services via the “query” mechanism as well as custom services.