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Text elements for narrative text

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No use of archetype internal value sets or external terminology value set.

Data type: DV_TEXT with no constraints.

Example: "Description" elements in many archetypes. 

Text element for a choice of coding

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(preferred) but where we know that free text may have to be entered

Data type: DV_TEXT with no constraints, and coding with terminology mentioned in comment.

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Intent: DV_TEXT will be constrained to DV_CODED_TEXT when coding is used, in a specialisation, template or application.

Examples: Problem/diagnosis name, Medication name.

Text element for coding where there's a set value set that will never change

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Data type: DV_CODED_TEXT with an internal value set.

Example: Laterality (left/right).

Text element for coding where we have a fair idea about what the value set could be, but there could be local use cases or mandated national code sets

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Data type: Choice of DV_TEXT with no constraints

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/DV_CODED_TEXT with an internal value set

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, OR Choice of DV_TEXT with no constraints/DV_CODED_TEXT with an external terminology value set (usually only in national archetypes).

Intent: In specialisations or templates where a local value set is needed, the DV_CODED_TEXT with an internal value set is removed, and the DV_TEXT is

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constrained to DV_CODED_TEXT and an external terminology value set added.

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Example use case: Where coding is definitely preferred but there are exceptions where the

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value is not yet coded or cannot be coded e.g experimental drugs, foreign products not on national dictionary

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Example: "Overall test status" in OBSERVATION.laboratory_test_result.

HTML Comment
Is the use case for 5 not the same as 2? Not exactly - we may actually want to specify an external terminology binding like dm+d / FEST but not mandate it (much more likely at template level but I did do it once for a UK archetype. Ok, so this is the same as the last example, only with a terminology value set instead of an internal one in the archetype. I've worked it into the last example.