Date
20:00 UTC on Tuesday 2 June 2020 - 90 minutes.
Objectives
- FHIR Terminology Services and Resources
Meeting Details
Online: https://snomed.zoom.us/my/snomedhl7
Phone: See https://zoom.us/zoomconference for available phone numbers (meeting id 242-348-6949)
Chat: public-snomedintl.slack.com # snomed-hl7-fhir (ask for invite!)
Zulip Chat: https://chat.fhir.org/#narrow/stream/179202-terminology
Attendees
Rob Hausam, Peter G. Williams, Peter Jordan, Jon Zammit, Kal Parmar, Sander Mertens, Suzy Roy, Linda Bird
Apologies
Meeting Recording
Discussion items
| Item | Description | Mins | Owner | Notes & Actions |
|---|---|---|---|---|
| 1 | Welcome and introductions | 2 | Recording, notes & attendance. | |
| 2 | Summary of previous week and previous fortnight | 5 | ||
| 3 | Other Meetings | 10 | Upcoming events: April 14: HL7 FHIR Connectathon is going to run May 13-14-15, a 24 h event. Update 19 May: 677 participants, running continuously over 48 hours. Breakout sessions easier (and more numerous) due to separate Zoom calls. Steer from GG to try to make the designations extension we're working on applicable more broadly to other code systems. Code System Supplements discussed as an alternative mechanism for supplying patient friendly terms. Breakout on federated behaviour & pre-release codes (http://snomed.info/xsct ← this would apply to the version string, rather than the CodeSystem. Discussion continues with the Vocab Workgroup). FHIR Dev Days also an online event June 15 - 17. HL7 Baltimore Sept 19 - 25. Confirmed fully virtual event. Connectathon Sept 9 - 11 (two weeks earlier) SI Business + Expo October November FHIRLY Dev Days
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| 4 | Use of system and version parameters in Lookup and Subsumes | 15 | Clarification that system parameter is the "class" of the code system and so is always http://snomed.info/sct in our case. The instance of the code system ie a specific extension and effectiveTime should be supplied in the version parameter. Snowstorm and Ontoserver are aligned in this regard.. In the case of SNOMED CT we use a URI to declare our instance and so the system is entirely redundant in our specific case and the decision was made to not insist in it's use for Snowstorm.
DK: FSH apparently has no way of specifying the version of a CodeSystem. Daniel checking the ANTLR spec. https://github.com/FHIR/sushi/issues/473 | |
| 5 | GPS and FHIR value set url(s) | 15 |
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| 6 | What module(s) to use for the Canadian Edition | 10 | Peter G. Williams | List of SNOMED CT Edition URIs replaced with 4.4.2 Edition URI Examples TODO: Check UK Modules in 4.4.1 National Editions |
| 7 | Working with unversioned content | 15 | Proposed example: http://localhost:8080/fhir/ValueSet/$expand?url=http://snomed.info/sct/45991000052106/version/UNVERSIONED?fhir_vs=isa/27624003&designation=sv ML makes the case that unpublished content is not legitimate SNOMED and suggested using a not-SNOMED URI eg http://snomed.info/xsct/45991000052106 in this case the code system would still be http://snomed.info/xsct Outstanding question: our pre-release (alpha + beta) packages do have a version as a future date in them, and continue to exist (although unpublished) even after the official release has shipped. How would this look in a ValueSet expansion? Should we specify systemVersion or forceVersion in this case? Update 2 June: LOINC have a similar issue with "Pre-release" identifiers - current release 2.6.7. Version 2.6.8PRE will contain the pre-release content. "To be useful they need to be considered part of the code system" However in the case of SNOMED CT we would NOT condone unpublished identifiers being used in production systems. In the case of the COVID-19 concepts an interim release was done as an official release for 20200309. The use case here is for producers of SNOMED CT to reference concepts internally - as a work in progress. | |
| 8 | FHIR Roadmap | 5 | Peter Jordan | R5 being pushed back. GG seeking opinion on 4.1.0 - an opportunity to clean up some descriptions. |
| 9 | FHIR Server Federation | 10 | Use case for fall back lookup when server does not know the answer to any particular question eg a façade server which has knowledge of all services it could potentially delegate to. | |
| 10 | Language Reference Sets in FHIR | 45 | All | Mechanisms for working with Languages Update 19 May: Suggestion that we work an example for SNOMED to discuss with Regenstrief (LOINC) Update 2 June: Started worked example Designation Extension Example |
| 11 | SNOMED Family of Languages | 10 | Impact of proposed changes (eg text searching in ECL) on FHIR. Questions around which language reference sets to use when there are multiple, especially partial/overriding context (referred to MAG for discussion) | |
| 12 | SNOMED FHIR Implementation Guide | 60 | Implementation Guide for using SNOMED CT with FHIR. Update 10 Dec: DK - main problem is URI/Ls which publisher has fixed ideas about. Publisher does not examine all folders - looks in profiles but not subfolders and doesn't seem to look in ValueSet folder. Update 21 Jan: DK and RH have merged commits and these can be seen in the HL7 server build: http://build.fhir.org/ig/IHTSDO/snomed-ig/branches/new-template/ and build errors here: http://build.fhir.org/ig/IHTSDO/snomed-ig/branches/new-template/qa.html Update 11 Feb: Grahame said that he'd show us how to set the URI so that it doesn't have to follow the base URI. Next person to try that can we fire a Zulip off to ask about it? IG Documentation: http://build.fhir.org/ig/FHIR/ig-guidance/index.html Also look at the sample IG https://github.com/fhir/sample-ig see build http://build.fhir.org/ig/FHIR/sample-ig/
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| 13 | Any other business | Next time: Revisit IG |
Potential Items for Discussion
| Description | Owner | Notes & Actions | |
|---|---|---|---|
| API for FHIR Resource ↔ Post coordinated expression mapping | API for FHIR Resource to SNOMED Expression
| ||
| Looking up an SCTID in an unknown module | Problems when dependencies do not align. Multiple code system resources represent multiple editions / versions. ML: See code parameter to code system search. Should return code systems (ie versions) where that code is defined. International concepts would appear in every edition known to the server. eg /CodeSystem?system=htp://snomed.info/sct&code=12345678&_elements=version
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| GPS | See Discussion on Global Patient Set (GPS) | ||
| FHIR Shorthand | Michael Lawley | https://github.com/HL7/fhir-shorthand/wiki https://build.fhir.org/ig/HL7/fhir-shorthand/FSHQuickReference.pdf Tooling: https://github.com/FHIR/sushi | |
| $lookup operation - properties returned | Peter Jordan | Using http://ontoserver.csiro.au/vstool/ I noticed that both Ontoserver and SnowStorm return a SNOMED CT $lookup property for effectiveTime, which I don't see listed, as one of the SNOMED CT properties in the FHIR R4 specification at http://hl7.org/fhir/snomedct.html. Should we create a Jira TIcket to add this? Completed - https://jira.hl7.org/browse/FHIR-26555 | |
| Use of url parameter | 15 | CodeSystem "class vs instance" in url parameter between CodeSystem and ValueSet operations. CodeSystem is understood. In Valueset, url is the ValueSet url for example url = http://snomed.info/sct?fhir_vs= allows for the version URI to be used as stated in https://build.fhir.org/snomedct.html The base URL is either http://snomed.info/sct The ValueSet version valueSetVersion is just some string identifier eg a timestamp or 0.1.0 | |
| ECL in the Valueset Expression Extension | 10 | Check whether SNOMED ECL is (or should be) registered as a MIME type (as per RFC 4289/BCP 13), or alternatively added to the expression-language code system and value set, for use in the valueset-expression extension used with the ValueSet resource. For example, HL7 have registered application/json+fhir This is useful for a ValueSet extension which allows any language to be used to define the selection criteria for an intensional definition using a MIME type. This group has no current reason to use that extension given the existing core specification support for implicit ValueSet definition and the support within the compose element. RDF community may have an interest. Update 2 June RH: Existing small valueset extended in BCP13 (existing known codes could be published as a CodeFragment). Vocab Working Group discussion ongoing. | |
| Behaviour on Lookup | 10 | What properties are returned? Discussion: Both Ontoserver and Snowstorm are returning EffectiveTime which is not listed here (unlike other SNOMED specifics): https://build.fhir.org/snomedct.html
Point of interest: Grahame's server returns a copyright property. Update 7 April - Question about whether this is required / desirable? |
Meeting Files