Normalize synonymous ICD-11 expression codes for consistent searching

[filiperochalopes]

User story

As a user, I want ICD-11 expression codes that are synonymous (same components, different order) to be normalized so concepts are labeled and mapped consistently.

Use case

Map a concept to an ICD-11 expression code and ensure equivalent expressions resolve to a single normalized representation.

Requirements

• Define normalization for synonymous ICD-11 expressions where component order differs, e.g.:
  • Stem1/Stem2 == Stem2/Stem1
  • S1&Extension1&Extension2 == S1&Extension2&Extension1
• Provide a stored procedure (or equivalent DB routine) to automatically calculate/resolve synonymous codes to the normalized form.
• Apply normalization when labeling and mapping concepts to ICD-11 expression codes.

Acceptance criteria

• Given two ICD-11 expression codes that only differ by component order, when processed, then both resolve to the same normalized code.
• Given a concept mapped using any synonymous expression, then the stored procedure returns the normalized code used for labeling/mapping consistently.

[askanter]

Let's see if we can determine if there is a preferred method for concantenating codes, or at least determine if the ICD-11 API returns them in a particular order so that we can use that order if possible.