Extension Medication Type context has entries for ValueSet and CodeSystem

[robeastwood-agency]

The extension Medication Type has the expected StructureDefinition.context values related to various medication profiles.

However it does also contain 4 context entries for ValueSet and CodeSystem, which look unnecessary and potentially incorrect. See lines https://github.com/hl7au/au-fhir-base/blob/master/resources/structuredefinition-medication-type.xml#L54-L69

Without knowing the background to how this extension came about, and specifically the lines linked above, I am raising here for consideration of appropriateness, rather than simply offering line deletions in another PR.

I'm told that this zulip thread has related background: https://chat.fhir.org/#narrow/stream/179173-australia/topic/concept.20type.20extension

[dtr-agency]

@oridashi please reply on this - this will need to be addressed in the ballot.

[brettesler-ext]

These 4 context issues are correct for defining medication type in CodeSystem content and expressing them as ValueSet expansions - so will remain.

this is a use for defining a classification for code systems/valueset expansion 1) more guidance on this is needed in narrative to expain this use 2) consideration is needed on being able to enable ValueSet definitions to add medication type extensions at that level (based on CodeSystems that do not have medication type defined)

[robeastwood-agency]

Raised HL7AU ballot 4.1.0 ticket: FHIRIG-238

[dt-r]

Narrative was added via https://github.com/hl7au/au-fhir-base/commit/25f3324edbaf9dbf566422ea58ae84e82ae32081.

Please review.

[robeastwood-agency]

Closing with no change required.