Context - This is a proposal from Google based on our experience consuming schema.org Product markup and working with similar data from online merchants. If it were accepted, it would make it easier for us and others to identify products sold online.

Proposal - Schema.org supports a variety of industry-standard product identifiers, for example gtin, mpn, and nsn. We propose to add a new property asin of type Text for use on Product, representing the Amazon Standard Identification Number. Given its common and broad use in the industry it would be beneficial to allow products to be identified with their corresponding ASIN code in structured data.

Alternatives - An alternative option would be supporting ASIN through the existing productID property. However, given the broad usage of ASIN, support as a first-class property seems more appropriate.