document type
For a media item whose medium is a document, which kind of document it is — a safety data sheet, instruction manual, spec sheet, warranty document, user guide, quick-start guide. A qualifier of the media-item property; the finer typology that media role's 'reference document' value is too coarse for (so a buyer can ask for the safety data sheet specifically). A token from a growing vocabulary. A document is a media item with medium document, not a separate asset host.
Document type is answered with one word chosen from the document types list — the same word shared across every product that uses it.
It is a qualifier of media — it has meaning only inside a media statement, one per statement, never on its own. It belongs with media to media — how it is shown.
It is answered inside every media statement, not as a standalone question on a kind.
Answered inside every media statement — not a standalone slot on any kind.