Looking at revising ISO 19115-1:2014, I have listed the code lists & enumerations. Comparing my list (extracted from the document / UML) with the list at https://def.isotc211.org/#persistent-identifiers, I find an oddity:
Keyword Type Code - Bio | https://def.isotc211.org/19115/-1/2014/ExampleOfExtendedMatadata/code/KeywordTypeCode-Bio