The registry vocabulary.

A stable commercial concept grouping several variants. « Ground filter coffee » is a product; the 750 g and 930 g formats are two of its variants.

The actually purchasable unit, identifiable by a barcode: a given flavour, size, market or formulation.

The GS1 identifier printed under the barcode, of 8, 12, 13 or 14 digits. We treat it as a string: its leading zeros matter, and its last digit is a verifiable check digit.

The link between a retailer and a variant, through that retailer's internal reference. A single product has as many listings as there are chains selling it.

The commercial terms of a listing over a period and channel: in store, online, with or without membership conditions.

An immutable fact: this price, at this place, on this date, seen by this source. A new observation never overwrites the previous one.

The chain allowing you to trace a displayed fact back to its source, extraction method and timestamp.

The dated link between a company and a product: manufacturer, brand owner, importer, distributor or packer. A company can manufacture a product without owning its brand.