Just check this page Artifacts Summary - OpenEHR Base package v0.1.0
Interesting read! But I suspect they’ve put the description of DV_INTERVAL with both DV_INTERVAL and DV_ORDINAL.
Edit: Also DV_COUNT’s description both with DV_COUNT and with DV_PROPORTION.
I don’t know what’s the quality status of that spec, and that site might be WIP. Anyway it’s interesting and it’s in a very user friendly format.
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@grahamegrieve made it by hand during meetings XD
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I’ve been meaning to check out what happens when generics get involved in openEHR ←→ FHIR mappings at the data type level. It looks like this is not yet addressed at the logical model based approach. To avoid invoking the impression of an entitled snob with that previous sentence, let me say that I did not mean to express an expectation; this is not a trivial semantic bridge, and it will probably require the same kind of materialisation trick we resort to in XML schemas. Things would get even more fun with reference ranges etc. because there’s some data level recursion there which cannot be constrained at the type level.
I think @grahamegrieve had a note somewhere (in the github repo?) suggesting that this was supposed to be a representation for machines to process, and not for us carbon based life forms 
but the nice formatting helps it serve a dual purpose I think. Nicely done.