TO DO (operator, 2026-09-23). HAVE: FieldType Taxonomy with @TermSet, used by 6 columns (SourceCategory, Industry, LeaveType, JobLevel, Jurisdiction, ProductCategory), validated against the term set on write. SHAREPOINT: TaxonomyFieldType and TaxonomyFieldTypeMulti (single and multi-value), bound to a term set (and optionally an anchor term); the Enterprise Keywords column (a shared, open folksonomy term set); Metadata Navigation and Key Filters on a list (a term-set tree to browse by); term-driven site navigation. MISSING: multi-value, anchor terms, Enterprise Keywords, metadata navigation / key filters on list views. Depends on TPL.12 for stable term ids.