Commerce

Name: Commerce (crubal.com/commerce)
License: https://creativecommons.org/licenses/by/4.0/

crubal.com/commerce: the machinery of selling. It attaches to items and services; it is never part of the core (chapter 1, "the engine is universal at the kind level").

Identity	`crubal.com/commerce`
Version	`2026-10-14`
Extends	`crubal.com/product /2026-10-14`, `crubal.com/service /2026-10-14`
Licence	CC-BY-4.0
Files	package.crubal · package.json · 2026-10-14/package.json

Facets

Key	Type	How many	Values and settings	Same as
`price`	number	one	unit currency	schema:price
`compareAt`	number	one	unit currency
`cost`	number	one	unit currency
`sku`	text	one	up to 80 characters	schema:sku
`stock`	number	one
`offerStatus`	choice	one	draft, listed, reserved, sold, withdrawn
`shippingWeight`	number	one	unit kg, accepts g, lb, oz
`shipsFrom`	text	one
`taxCode`	text	one

Classes

Offer `Offer`

For item, service.

Facet	Asked	Level
`price`		unit
`compareAt`		unit
`cost`		unit
`sku`		unit
`stock`		unit
`offerStatus`	required	unit
`shippingWeight`
`shipsFrom`
`taxCode`

Rules

Rule	When	Then	Strength
`listedNeedsPrice`	offerStatus is listed	price has	must
`costIsStaff`		cost shown to staff	must
`soldHasNoStock`	offerStatus is sold	stock in 0..0	should

Use it

package: mine /2026-10-14
  owner: example.com
  extends: crubal.com/commerce /2026-10-14
  prefixes:
    commerce: crubal.com/commerce