Extension slices should use camelCase identifiers.

[RadixSeven]

Bug

The extension slices in NCPI Participant and NCPI Study Participant are named with kebab-case-identifiers. This is not the standard for FHIR.

FHIR fields from HL7 are named with lower camelCase. For example, Patient.birthDate and Patient.multipleBirth[x].

US core extension slices are named with camelCase. For example, US Core Ethnicity Extension.extension:ombCategory and US Core Race Extension.extension:ombCategory

Standard extensions from HL7 also use camelCase. For example, Person Recorded Sex Or Gender effectivePeriod

Expected behavior

Lower camelCase identifiers should also fill the url field of the slices in the extensions in the NCPI IG. For example, some slice names in Participant should be usCoreBirthSex, usCoreRace, and ageAtLastVitalStatus

[mingward]

In the code (

ncpi-fhir-ig-2/input/fsh/modules/participant.fsh

Lines 76 to 87 in bfd7fcb

	* extension contains USCoreBirthSexExtension named us-core-birth-sex 0..1
	* extension[us-core-birth-sex] ^short = "Sex assigned at birth (or pre-natal observed sex)"
	* extension contains USCoreRaceExtension named us-core-race 0..1
	* extension[us-core-race] ^short = "US Core Race"
	* extension contains USCoreEthnicityExtension named us-core-ethnicity 0..1
	* extension[us-core-ethnicity] ^short = "US Core Ethnicity"
	* extension contains ResearchPopulation named population 0..1
	* extension[population] ^short = "Population, Race, and/or Ethnicity information."
	* extension contains ResearchDateOfBirthMethod named dob-method 0..1
	* extension[dob-method] ^short = "Specifies method used to alter DOB for research sharing. Details should be available in the study protocols."
	* extension contains AgeAtLastVitalStatus named age-at-last-vital-status 0..1
	* extension[age-at-last-vital-status] ^short = "Age or date of last vital status"

):
Example, Eric pointed out that the FHIR convension on name and case:
Currently it has: CodeSystem: ResearchDataDateOfBirthMethod
FHIR's convesion of camelCase should be:
researchDataDateOfBirthMethod