Flattened archetype is lacking terminology and language bindings

Ok, turns out I had some more time than expected. The branch of archie in Opt 1.4 parser and converter by pieterbos · Pull Request #261 · openEHR/archie · GitHub now actually converts at least some 1.4 OPTs to a working ADL 2 template.
The resulting template is int differential source form, which can relatively easily be edited by hand or with tools. It can be converted to OPT 2 easily as well with the existing Archie tools, or the visual studio code extension.

This is still very experimental, but might be worth a try. Even just loading an OPT 1.4 into AOM 2 and to use it from there with the at-style nodes and adl 1.4 semantics is possible, and path lookup will work.

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OPT 1.4 → OPT 2 conversion should now mostly work in that branch. Still very experimental and somewhat untested, but if you’re willing to experiment and perhaps manually fix some minor issues in the ADL output, it could work.