identifier exists
A structural declaration of whether this product is expected to carry a manufacturer trade identifier (a GTIN/MPN) at all — Google Merchant's identifier_exists. A positive 'no' marks a product that genuinely has none (handmade, custom-made, private-label, vintage), distinguishing 'this product type has no identifier' from 'none has been entered yet' (the latter is content debt, L13, not this fact). A governed token, cardinality one, from a yes/no vocabulary. Not the identifier itself (that is `trade_identifier`); the assertion that one is or is not expected.
Identifier exists is answered with one word chosen from the identifier expectation list — the same word shared across every product that uses it.
It belongs to identity — who and what it is.
asked by the kinds that answer it
49 kinds answer it, each for a single value. The same question can be reused by unrelated kinds — one meaning, many homes.
asked by kinds that answer it
The same question can be reused by unrelated kinds — one meaning, many homes.
| kind | how many |
|---|---|
| Product | one |