qualifier token a chosen word

filtration standard

The published test method the rating and efficiency were measured under — ISO 16889, ISO 19438, ISO 5011, ISO 11155, SAE J806. A qualifier of `filtration_rating`: two makers quoting 99% under different methods are not quoting the same thing.

Filtration standard is answered with one word chosen from the filtration standards list — the same word shared across every product that uses it.

It is a qualifier of filtration rating — it has meaning only inside a filtration rating statement, one per statement, never on its own. It belongs with filtration rating to measurement — its measurable, physical facts.

It is answered inside every filtration rating statement, not as a standalone question on a kind.

answered with: ◇token — a token — a word chosen from a fixed vocabulary, shared and filterable across products.
value domain: Filtration standards — the vocabulary its answers are drawn from.
qualifier of: filtration rating — one per statement — it has meaning only inside that host's statement.

Answered inside every filtration rating statement — not a standalone slot on any kind.