availability constant
IRI for schemahttp:availability [Expects: http://schema.org/ItemAvailability]
The availability of this item—for example In stock, Out of stock, Pre-order, etc.
Can be used on: http://schema.org/Demand, http://schema.org/Offer
Implementation
static const availability = IriTerm.prevalidated(
'http://schema.org/availability',
);