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Specification:

FHIR Core (FHIR)
Raised in Version:

R5
Work Group:

Modeling & Methodology
Related URL:
http://hl7.org/fhir/datatypes.html#id
Related Artifact(s):

DomainResource
BaseResource
Related Page(s):

Schemas & Schematrons
Resolution Description:

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The id datatype is a) normative and b) taken from an ISO identification standard so we can not change it. Instead, we will change Expression.name to be a code with the invariant that it match the regex '[A-Za-z][A-Za-z0-9\_]{0,63}'. This will allow the _ character but not the - or the . to be in variable names and will also require a starting alpha character.

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The id datatype is a) normative and b) taken from an ISO identification standard so we can not change it. Instead, we will change Expression.name to be a code with the invariant that it match the regex ' [A-Za-z] [A-Za-z0-9\_] {0,63}'. This will allow the _ character but not the - or the . to be in variable names and will also require a starting alpha character.
Resolution Vote:
Lloyd McKenzie / Grahame Grieve: 5-0-0
Change Category:
Enhancement
Change Impact:
Non-compatible
Applied for Version:

R5

Id data type is used in many places, and one of them is name field in Expression]. It is useful to include '_' in variable/expression names. (https://chat.fhir.org/#narrow/stream/179255-questionnaire/topic/variable.20name.20required.3F)