Hi Tim,
to my knowledge there is nothing in place right now. This issue is also on the agenede of the TDWG Earthscience specimen and Paleopbiology Interest Group. I am leading a task in DiSSCo Prepare on the User stories / use cases for earthsciences and could contribute from this site as well. In this task we will consolidate everything on requirement analysis / user stories already conducted and add missing stakeholder surveys. I sure one of the outcomes / requirements will be controlled machine readable vocabularies! We really should join forces!
Hope this helps!
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