In an allergen table the commonest error is not a wrong entry but reading “not filled in” as “free from”. If a dish is not marked for peanuts, has someone confirmed it has none, or has no one looked? In a table of tick-boxes the two cases look the same.
So in the dish library each allergen takes one of three states: contains, may contain, free from. “May contain” covers cross-contact — the same wok, the same fryer. Beside the state there is its origin: declared by the restaurant, or inferred from the recipe.
Declaration over inference. An inference is only a hint. It is shown to guests as declared only after the restaurant has confirmed it.
Field definitions are in the data standards.
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