FHIR Chat · Slicing on an optional element

Stream: conformance

Topic: Slicing on an optional element

Josh Mandel (Apr 24 2019 at 18:51):

@Mark Kramer Looking through http://standardhealthrecord.org/guides/mcode/index.html -- super cool! Quick question on profiles... I clicked around to:

http://standardhealthrecord.org/guides/mcode/StructureDefinition-shr-core-BodyHeight.json

and found:

      {
        "id": "Observation.code.coding-Fixed-8302-2.code",
        "path": "Observation.code.coding.code",
        "name": "Observation.code.coding-Fixed-8302-2.code",
        "short": "Symbol in syntax defined by the system",
        "definition": "A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).",
        "requirements": "Need to refer to a particular code in the system.",
        "min": 0,
        "max": "1",
        "type": [
          {
            "code": "code"
          }
        ],
        "fixedCode": "8302-2",

which seems to say that the code is fixed but the element is optional. Is this intentional? (I'm not sure how to interpret it, and by comparison http://build.fhir.org/bodyheight.profile.json makes the equivalent element required:

    {
      "id" : "Observation.code.coding:BodyHeightCode.code",
      "path" : "Observation.code.coding.code",
      "short" : "Symbol in syntax defined by the system",
      "definition" : "A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).",
      "requirements" : "Need to refer to a particular code in the system.",
      "min" : 1,
      "max" : "1",
      "base" : {
        "path" : "Coding.code",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "code"
      }],
      "fixedCode" : "8302-2",

Josh Mandel (Apr 24 2019 at 18:54):

For this matter, I'm also wondering whether the ids should use colons instead of dashes, like Observation.code.coding:Fixed-8302-2.code instead of Observation.code.coding-Fixed-8302-2.code?

Josh Mandel (Apr 29 2019 at 20:20):

For now I've submitted a bug to CIMPL (https://github.com/standardhealth/shr-cli/issues/199).

Chris Moesel (Apr 30 2019 at 01:07):

Hi @Josh Mandel -- as for the card being 0..1 instead of 1..1 -- I agree. That appears to be a bug in the tooling. I thought that we set the card to 1..1 whenever we fixed something on the element, but obviously that's not the case.

Chris Moesel (Apr 30 2019 at 01:13):

As for the id, I'd love to use : instead of -, but I ran into a little-known and even-littler-discussed secret of DSTU2: technically : (and even [ and ]) are not allowed in DSTU2 ids. It's spelled out in the DSTU2 spec here: http://hl7.org/fhir/DSTU2/datatypes.html#id

Chris Moesel (Apr 30 2019 at 01:15):

There's some unresolved conversation about it here and here.

Last updated: Apr 12 2022 at 19:14 UTC

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FHIR Chat · Slicing on an optional element · conformance