HasPrice

HasPrice is a binary relation used in data schemas to connect an entity, such as a product or service, to its monetary price. In many knowledge graphs and ontologies, hasPrice links the subject to a numeric value or to a structured monetary object. It is commonly found in e-commerce vocabularies, product catalogs, and linked data representations.

Semantics and modeling: The typical interpretation is that the subject possesses a price indicated by the object. Depending on the vocabulary, the object may be a literal number (e.g., 29.99), or a Money or Price value object that includes currency. In some schemas, separate properties for currency (priceCurrency) or priceSpecification are used to handle currencies and pricing rules.

Handling multiple prices: For items with variants, discounts, or regional pricing, there may be multiple hasPrice assertions, or a more expressive structure such as a PriceSpecification, PriceOffer, or Offer with validFrom, availability, and currency. This avoids ambiguity about which price applies in a given context.

Practical considerations: Ensure currency is specified, prefer explicit currency codes (ISO 4217), and consider provenance and timestamp for price validity. Do not assume hasPrice implies current or retail price; it may reflect list price, historical price, or a price at a specific time.