Stream: implementers
Topic: Fixed value
Aritra Kundu (Mar 05 2021 at 20:26):
Hi Team,
Can anyone help me to interpret what is Fixed Value: (complex) suggest ?
Ex: DiagnosticReport.category.coding , Observation.category.coding etc.
Regards,
Aritra
Lloyd McKenzie (Mar 05 2021 at 21:00):
That's something you'll only see in a profile - and it should be rare. In most cases, profiles should be using 'pattern' rather than 'fixed value'. What it's saying is that it's fixing the value for a complex data type - in this case Coding. That means it's defining a value for Coding.system, Coding .code and possibly Coding.display. It's also preventing other elements, such as Coding.verison, Coding.id and Coding.extension from being present.
Eric Haas (Mar 05 2021 at 21:17):
here is an example of fixed value rendering in a profile:
Eric Haas (Mar 05 2021 at 21:18):
vs example of pattern rendering in a profile:
Eric Haas (Mar 05 2021 at 21:19):
both do the same thing... limit your choices. The arcane differences are explained by Lloyd
Eric Prud'hommeaux (Mar 06 2021 at 07:04):
so the pattern to which Lloyd referred is on the code, not the coding
Eric Prud'hommeaux (Mar 06 2021 at 07:43):
to put these into one example and git rid of the slicing details, i guess this data:
{ "coding": {
"system": "http://loinc.org",
"code": "85354-9",
"version": "2.67",
"display": "Blood pressure panel with all children optional.",
"id": "common-coding-loinc-85354-9",
"language": "en",
"meta": { "source": "http://myemr.example/standards" }
} }
would not conform to this closed structure:
└📦 code S 1..* CodeableConcept Blood Pressure
│
└📦 coding S 1..* Coding Code defined by a terminology system
│
├▭ system S 1..1 url Identity of terminology system
│ Fixed Value http://loinc.org
├▭ code S 1..1 code Symbol in syntax defined by the system
│ Fixed Value 85354-9
└▭ version S 1..1 code Version of the system - if relevant
Fixed Value 2.67
because "display", "id", "language" and "meta" aren't permitted by a closed complex object.
It would, however, conform to:
└📦 code S 1..* CodeableConcept Blood Pressure
│ Required Pattern: At least the following
└🔒 coding 1..* Coding ode defined by a terminology system
│ Fixed Value: (complex)
├🔒 system 1..1 url dentity of terminology system
│ Fixed Value http://loinc.org
├🔒 code 1..1 code Symbol in syntax defined by the system
│ Fixed Value 85354-9
└🔒 version 1..1 code Version of the system - if relevant
Fixed Value 2.67
because the rest of the Coding attributes are permitted.
Lloyd McKenzie (Mar 06 2021 at 18:07):
language and meta aren't allowed period because they're not supported in the base type for Coding - which is closed. (There's an extension for language and meta is only allowed at the resource level, not the data element level.)
Last updated: Apr 12 2022 at 19:14 UTC
